One of our Forum members asked us the question: “Does anybody make a good range box with cradles for cleaning at the bench?” The answer is yes — the MTM model RBMC Range Box offers slide-in plastic cradles that provide a reasonably sturdy platform for a quick clean when you’re done shooting. The RBMC box also offers plenty of storage for jags, brushes, solvents, ammo boxes and other miscellaneous gear you need for the range.
Among the many range boxes available, the MTM model RBMC Range Box leads the pack in terms of versatility. It is rugged, it has plenty of storage space, and it doubles as a handy cleaning station. This Editor has used the MTM Range Box to clean rifles and as a “range expedient” rifle holder when adjusting scopes and tensioning action screws. It’s a good product that does the job and stands up to rough handling. The MTM Shooting Range Box is in stock now for $49.99 at Midsouth (green version).
Fitted Cleaning Cradles
The key feature setting MTM’s RBMC apart from most range boxes is the rubber-coated cradle system. Wide enough to fit a 3″-wide fore-arm, the cradles slide into vertical slots on either end of the box. This allows your range box to serve as a maintenance station. The RBMC is really pretty stable in this role, and the cradles won’t mark your stock. The cradles even feature slots on each side to hold your cleaning rods. The MTM Range Box is secure enough to stay in place when you’re brushing the barrel. However, if you’re working on a carpeted bench top, keep one hand on the box when running a cleaning rod through the bore, just to ensure the box doesn’t slide.
Versatile Upper Tray with Dividers
The MTM Range Box has two major components — the box base (with cradles), and a large upper tray with hinged top and carry handle. This large upper tray clamps securely to the bottom unit for transport. The top tray has a long section that holds cleaning rod guides, long brushes, grease syringes and the like. There are two, clear-plastic fitted divider trays. These will hold your patches and jags, plus comparators, ring wrenches, and other small tools.
MTM offers a black “tactical” Range Box for $50.71 at Midsouth. This black Tactical Range Box includes a special bracket that supports AR-type rifles through the magazine well. As show at right, this is red. However, some previous production models had black magwell brackets (see below).
What Might Be Improved
Though we really like the MTM Range Box, it’s not perfect. First, we wish the box was a bit deeper, to have added carrying capacity. The dimensions of the MTM Range Box are: 25″ long x 11.5″ wide x 8.75″ high. We’d like to see it 12″ high/deep to allow larger solvent bottles to stand upright and to provide more space to carry tools and shooting muffs. However, it is deep enough to hold the large 100-round MTM cartridge boxes that are popular with many shooters (see photo at right).
While we like the twin clear plastic dividers that fit into the removable top-tray, but we wish the dividers had individual hinged tops. This would keep small items more secure.
Share the post "MTM Range Box with Gun Cradle — Handy, Versatile Storage"
For many years, the U.S. Army Marksmanship Unit (USAMU) regularly published reloading “how-to” articles on the USAMU Facebook page. In this article, the USAMU’s reloading gurus address a question frequently asked by prospective handloaders: “Should I buy a single-stage press, or a progressive?” The USAMU says the best answer is Solomon-esque in both its wisdom and simplicity: “Get BOTH!” However, there is definitely more to the issue, as the USAMU explains below.
Progressive Press Safety Considerations
by USAMU Staff
Many are the beginning handloaders who have asked a friend about their “setting up” a progressive press for them. The idea is that the newbie could then just feed in components and crank out buckets of practice ammo without needing to really learn much about handloading. Tempting though this might be, that’s simply not how it works. Such an approach might be ok if there were never a malfunction with either press or operator, but that’s unrealistic. Our hypothetical newbie would then lack the knowledge to problem-solve most situations.
Worse yet, several different handloading operations would be occurring at different stations on the progressive press at the same time. It takes an experienced operator to keep track of, and truly understand the significance of, all those potential mini-problems. Loading without this experience is a recipe for potential disaster – such as a double powder charge (especially with pistol cartridges) dropped while the loader was attending to some other function, etc. Progressives are an animal unto themselves, and while they offer many benefits, they do take some getting used to – even by experienced handloaders!
ILLUSTRATIVE HORROR STORY
Here, enter a 40-year veteran handloader who decided to jump onto the progressive bandwagon late in his career, having used only single-stage presses all his life. A High Master NRA High Power Rifle competitor, he had no background in competitive pistol shooting, where historically most progressive presses are found.
Experienced Action Pistol shooters have typically encountered multiple episodes in which shooters “skipped” a powder charge for some reason, leading to a squib round and a bullet possibly lodged in the bore. Thus, at matches, it’s reflexive for them to yell “STOP!” in unison if they see a shooter get a “click” vs. a “bang”, and rack the slide to keep firing. This writer has personally seen several pistols saved in just such scenarios over the years.
Click No Bang — What NOT to Do
Our High Master set up a popular progressive press and began turning out .223 Rem 100-yard practice ammo with abandon. He was using a moly-coated 52gr match bullet and an economical, fast-burning surplus powder that gave great accuracy. Once on the range, he began practicing strings of rapid-fire. All was well, until he heard “Click!” rather than “Boom”.
Lacking the above experience or onlookers to halt him, he reflexively operated the charging handle on his expensive, custom NM AR15 Service Rifle, and the next trigger squeeze reportedly registered on seismographs over at least a three-state radius. He sat, uninjured but bewildered, until the hail of expensive bits and pieces quit raining down around him.
When the smoke cleared, he immediately cursed the horrid, evil, demonically-possessed progressive press for this, his first-ever reloading mishap. His $1400 NM upper was ruined, but thankfully, his $800 pre-ban lower… and he had escaped injury.
This tale is told not to discourage the use of progressive presses, but to emphasize the need to EASILY and IMMEDIATELY KNOW what is happening with the press at each station, every time the handle is cranked. Not to do so is, as they say, “bad ju-ju.”
It illustrates why we at the USAMU Handloading Shop agree in recommending that new handloaders should begin with a single-stage press. Once one thoroughly learns the steps in each phase of handloading by repeated experience, then one will be qualified to move on to a progressive press.
The single-stage press will REMAIN virtually indispensable for one’s entire handloading career, even after having purchased a progressive press (or two). There are endless small projects that are best handled on a single-stage press, and a poll of USAMU’s Handloading staff reveals that not one would willingly be without his single-stage press, despite owning at least one progressive.
Share the post "Single Stage vs. Progressive Presses — Function and Safety"
AR-15 Cartridge line-up image from 80% Arms, used with permission. This selection omits our favorite alternative — the 20 Practical (.223 Rem necked down to .204 Caliber).
Instead of using the standard .223 Remington or 5.56x45mm NATO round, you have many options for an AR-15, as shown above. This photo is from Complete Guide to Alternative AR-15 Rounds in the 80% Arms Blog. Some of the most notable alternative chamberings for AR-15s are:
20 Practical — Simply the .223 Rem necked down to .204 caliber. Requires new barrel. Same bolt, same magazines. Best Bang for the Buck. 6mm ARC — The 6mm ARC (from Hornady), is a SAAMI cartridge optimized for AR-platform rifles. The 6mm ARC is basically a 6.5 Grendel necked down to 6mm, with the shoulder moved back around .030″. 6.5 Grendel — Moderately expensive, 6.5 Grendel requires a new barrel, bolt, and magazines. Most use the 6.5 Grendel for competitive shooting and/or hunting. .300 Blackout — Moderately expensive, the .300 Blackout requires a barrel change. This is used for home defense, and hunting. WARNING — with some bullets this round can be chambered in a .223 Rem barrel, with disastrous consequences. .50 Beowulf — The most expensive alternative AR-15 cartridge, this requires new barrel and bolt. The .50 Beowulf was created for game hunting, but most hunters use something more practical.
Of these five options, our top choice is the 20 Practical, followed by the 6.5 Grendel. Check out our featured 20 Practical AR Rifle Report. This 20 Practical cartridge is highly effective on small varmints, and has shown outstanding accuracy in AR-platform rifles crafted by Robert Whitley.
20 Practical — High-Velocity, Affordable Alternative
The 20 Practical is simply a .223 Remington necked down to .204 caliber. This efficient little cartridge can launch 32-grainers at over 4200 fps, with impressive results on P-Dogs. This makes the 20 Practical a great choice for an AR-based varmint rifle.
20 Practical Ultimate Varminter
Many years back, as a “proof-of-concept”, AccurateShooter.com created a 20 Practical AR15 Ultimate Varminter with a custom 20-caliber upper from Robert Whitley of AR-X Enterprises, LLC. That project rifle was ultra-accurate — every 5-shot group out of the gun was less than the size of a dime. The 20 Practical cartridge is simply the .223 Rem necked down to 20 caliber — you can use standard .223 brass and load with standard .223 Rem dies. Just swap in a smaller expander and use smaller neck bushings.
20 Practical in AR15 Demonstration Video
6mm ARC — Popular New SAAMI Cartridge Promoted by Hornady
The 6mm ARC is basically a 6.5 Grendel necked down to 6mm, with the shoulder moved back around .030″. That pushed-back shoulder does reduce case capacity (and velocity), but we assume Hornady did that to create a shorter, proprietary chamber so people could not simply neck-down Lapua 6.5 Grendel brass, as has been done for years with Robert Whitley’s outstanding 6mm AR wildcat.
What Is the 6mm ARC Cartridge? The 6mm ARC cartridge is a modern SAAMI-spec cartridge based on the 6.5 Grendel case necked down for 6mm bullets, with the shoulder moved back 0.030. Yes it is designed to run in AR15-platform rifles. You’ll need a new barrel, bolt, and mags. If you already have an AR chambered in 6.5 Grendel, the ONLY thing you need to change is the barrel. Everything else — bolt, magazines, gas system – is compatible with 6mm ARC.
▶ Official SAAMI Cartridge (not wildcat)
▶ Fits standard AR15-platform rifles
▶ Fits Short/Mini action bolt rifles
▶ Efficient short, fat case design
▶ 30-degree case shoulder
What Do I Need To Shoot the 6mm ARC?
Faxon and Ballistic Advantage are already producing barrels, with more manufacturers sure to follow. All the other required components are already on the market for 6.5 Grendel rifles. Aero Precision already offers complete 6mm ARC uppers.
If you’re converting a standard 5.56×45 mm (.223 Rem) AR15 upper to shoot 6mm ARC, you’ll need a 6mm barrel, a Type II 6.5 Grendel bolt carrier group, and new magazines. Some folks have suggested standard AR mags will work, but trust us, you want magazines designed for 6.5 Grendel.
While 6-6.5 Grendel shooters are known to run stout pressures, the 6mm ARC cartridge has a relatively moderate Maximum Average Pressure (MAP) rating of 52,000 psi according to the official SAAMI specifications. For a variety of reasons, is wise to keep pressures in a semi-auto rifle moderate. Don’t chase the velocities you might get in a bolt-action gun.
The 6.5 Grendel — Accurate, Plus Good for Hunters
The 6.5 Grendel round is one of the most accurate cartridges for the AR-15 platform. The 6.5 Grendel round offers a larger-diameter, .264-caliber (6.5mm) bullet running at good velocities. This provides ample energy for smaller game and deer. The 6.5 Grendel is often used for hunting deer up to 300 yards.
History of the 6.5 Grendel Cartridge
The 6.5 Grendel originated as a 6mm PPC necked up to 6.5 mm. After Alexander Arms relinquished the “6.5 Grendel” Trademark, the 6.5 Grendel was standardized as an official SAAMI cartridge. It has become popular with target shooters and hunters alike because it is accurate, efficient, and offers modest recoil. Good for small to medium game, the 6.5 Grendel is becoming a popular chambering in lightweight hunting rifles, such as the Howa 1500 Youth Model.
The .300 Blackout — Risky Business
The .300 Blackout appeals to folks who want a .30-caliber defense round. This can be loaded at various velocities. Loaded at subsonic speeds and shot with a suppressor, the .300 BLK offers very low sound levels. Unfortunately, that .300 Blackout cartridge can fit in a .223 Rem chamber. Shooting a .308-caliber bullet in .223 bore is a recipe for disaster.
The .300 AAC Blackout aka “300 BLK”, is a compact 30-caliber cartridge designed to work in AR-15 rifles. It has a shorter cartridge case to accommodate the bigger 30-caliber bullet while still fitting in a standard AR-15 magazine. Unfortunately, that’s the danger. A careless shooter can toss a .300 Blackout cartridge in with .223 Rem rounds without noting. And because the case-head size is the same as the .223 Rem (5.56×45) the rifle’s bolt assembly will happily chamber and fire the .300 BLK round. Problem is, that forces a .308 diameter bullet down an undersized .223-caliber bore. Not good!
This images were provided by Tactical Rifle Shooters on Facebook. The message was clear: “Don’t try to run 300 Blackout in your .223/5.56mm. It won’t end well. The problem is identical rifles and identical magazines but different calibers.”
Image from Accurate Shooter Forum. Cutaway shows the jammed .30-Cal bullet:
For those who MUST have a .300 Blackout, here are some things you can do:
1. Use different colored magazines for .300 Blackout vs. .223 Remington.
2. Mark .223 Rem upper handguards with the caliber in bright paint.
2. Fit all your uppers with caliber-labeled ejection port covers.
4. Mark all .300 BLK Rounds with heavy black marker.
Share the post "Beyond the .223 Rem — Alternative AR-15 Cartridge Types"
Ever wondered how the parts inside an AR15 work together? Just exactly how does the reciprocating bolt carrier feed rounds from the magazine? How do the elements in the trigger group work and reset after each shot? How does the gas system bleed gas from the barrel and operate the bolt carrier? These and other questions are answered in this eye-opening video from 45Snipers. Using “cutaway” 3D computer animation, this 5-minute video shows all features of an AR15 inside and out. This fascinating firearms animation allows the viewer to look inside the upper and lower receivers, into the bolt carrier, chamber, barrel, and magazine.
This video starts off slow and has annoying background music, but it is well worth watching if you own or shoot any AR-platform rifle. It illustrates all the key operations during the charging, loading, firing, and ejection processes. The cutaway animation shows how rounds are stripped from the magazine and then chambered. It then shows how every part of the trigger group works, and how the firing pin strikes the primer. You can even watch the bullet move down the barrel before the empty shell casing is removed from the chamber and tossed out the ejection port. Here are sample frames from the video:
Video find by Grant Ubl. We welcome reader submissions.
Share the post "How AR15s Work — Watch 3D Cutaway Video Animation"
Today, AR-platform rifles are hugely popular. Dozens of manufacturers sell AR-type rifles, in a wide variety of configurations and calibers. But before there were M16s and AR-15s, ArmaLite produced a 7.62×51 caliber rifle, the AR-10. Yes before there were millions of 5.56 black rifles, there was a .30-caliber big brother with reddish-brown furniture. Invented by Eugene (‘Gene’) Stoner for the Armalite company in the late 1950s, this is the father of all of today’s AR-platform rifles. Way ahead of its time, this remarkable, select-fire battle rifle weighed just 7.25 pounds as first developed.
If you’re curious about the AR-10, in this video, Jerry Miculek puts an original 1957-vintage AR-10 through its paces on the range. This extremely rare, early-production rifle was provided by Mr. Reed Knight and the Institute of Military Technology. (The gun in the video was actually produced in the Netherlands under license, see video at 4:40.) This AR-10 is the direct ancestor of the AR-15, M16, and many of the modern sporting rifles that we use today.
The AR-10 was slim and light, weighing around 7 pounds. Some folks might argue that the original “old-school” AR-10 is actually better than some of today’s heavy, gadget-laden ARs. The AR-10’s charging “lever” was under the carry handle — that made it easier to manipulate with the gun raised in a firing position.
You’ll notice there is no “forward assist”. Inventor Gene Stoner did not believe a separate “bolt-pusher” was necessary. The forward assist was added to solve problems encountered in Viet Nam. Some critics say the forward assist “only takes a small problem and makes it a big problem.” For today’s competition ARs (that are never dragged through the mud) the forward assist probably is superfluous. It is rarely if ever needed.
Note also that the handguards are fairly slim and tapered. Today, six decades after the first AR-10 prototypes, we are now seeing these kind of slim handguards (made from aluminum or lightweight composites) used on “full race” ARs campaigned in 3-gun competition.
History of the AR-10
The AR-10 is a 7.62 mm battle rifle developed by Eugene Stoner in the late 1950s at ArmaLite, then a division of the Fairchild Aircraft Corporation. When first introduced in 1956, the AR-10 used an innovative straight-line barrel/stock design with phenolic composite and forged alloy parts resulting in a small arm significantly easier to control in automatic fire and over one pound lighter than other infantry rifles of the day. Over its production life, the original AR-10 was built in relatively small numbers, with fewer than 9,900 rifles assembled.
In 1957, the basic AR-10 design was substantially modified by ArmaLite to accommodate the .223 Remington cartridge, and given the designation AR-15. ArmaLite licensed the AR-10 and AR-15 designs to Colt Firearms. The AR-15 eventually became the M16 rifle.
AR-10 3D Model Shows Internal Parts
If you want to see more close-up details of the AR-10, computer artist Stefan Engdahl has created a very detailed 3D model of the AR-10 for use in computer simulations. This computer model features 18 separate objects so you can look at details of frame, barrel, trigger, sights and more.
Here are some additional images of early AR-10 models, with various configurations. Multiple handguard and muzzle options were employed during early development.
Color AR-10 photos from Arms Izarra, a Spanish company specializing in de-militarized, collectible firearms. Interestingly, this particular AR-10 was produced in the Netherlands under license.
Share the post "Sunday GunDay: First Gen AR-10 from the ’50s — Father of All ARs"
409,000,000 views! Today’s five feature videos have, collectively, been viewed 372 million times on YouTube. Today’s Saturday special features five remarkable animated firearms videos from Matt Rittman, a very talented computer graphic artist. Matt employs multiple software programs to create these incredibly detailed animations. His software tools of the trade include Cinema 4D, Substance Painter, and Corona renderer. Don’t think this is easy. Some of these videos took over 500 man-hours to create. Enjoy!
AR-15 Full Animation — Components and Function
While there are other AR-15 animations on YouTube, we think this is the most accurate and creative, showing the function of a wide variety of components, including the bolt carrier, extractor, trigger, stock buffer, safety system, forward assist, and mag release. It also shows modes of a military M16, showing 3-round burst fire, and full-auto, employing disconnectors and auto sear. If you are planning to assemble/disassemble an AR, this is definitely worth watching start to finish. This video has recorded over 2 million views in just three weeks!
4:00 Auto Fire
4:58 Burst Fire
6:22 Bolt Catch
6:40 Sights
7:33 Adjustable Stock
7:50 Ejection Port Cover
Mauser Kar-98K Bolt Action Rifle video
This elaborate 3D animation shows how a Mauser-type Karabiner 98 Kurz (aka Kar-98K) bolt-action rifle works. Substance Painter was used to create the wood stock texture. Creator Matt Rittman states that this 3.7 minute video took over 500 man-hours to create. You have to admire the dedication involved in that kind of hard work.
This 3D animation video shows the popular Glock 19 (Gen 4) pistol. This modern, polymer-framed, striker-fired pistol has constant trigger pull for all shots. Some folks call this a DAO (double-action-only) trigger but that’s not really correct. Unlike the Model 1911, on a Glock there is no external safety on the frame or slide. The trigger “shoe” (the part that contacts finger) includes a central blade. This prevents the gun from firing unless the trigger is depresses normally. Glock calls this the “safe action”. The creator, Matt Rittman states: “Cinema 4D was used to create each individual part, as well as animating everything. Substance Painter was used to create the main textures. Corona renderer was used to render everything. This animation [with 84.6 million views] took me over 500 hours to create.”
Elements of Video:
0:11 Basic Function
0:39 Case Extraction
0:47 Cartridge Loading
1:02 Trigger Reset
1:28 Trigger Safety
Pump shotguns are essential firearms for hunting and home defense. The clever design of pump-action shotguns make them reliable even when feeding large diameter, blunt-ended 12 gauge shot-shells.
With 233 million views, this AK-47 video might just be the most-watched firearms tech video on YouTube. The video highlights the design features the account for the AK’s legendary reliability. For viewers with an eye to detail Matt adds this clarification: “The firing pin does NOT puncture the bullet primer. It just strikes it against the anvil, initiating the firing sequence.”
AR owners know that their black rifles require regular cleaning and maintenance. And this modular platform allows many options for stocks, fore-arms, and optics mounting. That ability to customize is one of the AR’s major attractions, but customization requires solid understanding of the AR’s design and components.
To help AR owners optimize and maintain their rifles, Gun Digest Media has a 320-page illustrated book: AR-15 Setup, Maintenance and Repair. Authored by Patrick Sweeney, this paperback book is a “one-stop guide to repairing, maintaining and modifying America’s favorite rifle.” The current price for the book is $29.99 from Gun Digest, or $32.34 on Amazon. Gun Digest also offers a $29.99 Digital Download version.
GET FREE 40-Page AR-15 Book Sample
Note, if you are interested in the book, there is a substantial 40+ page FREE sample available on the Amazon site. You can see the entirety of the first two chapters from the Kindle digital version. CLICK HERE to visit Amazon.com and then click on the button labeled “Read Sample” below the cover image.
AR Set-Up and Maintenance
If you need to disassemble and maintain your AR rifle, swap barrels or handguards, add optics, or customize the stock, Gun Digest’s AR-15 Setup, Maintenance and Repair book tells you what you need to know. From field-stripping to barrel mounting and trigger installations, the book covers a wide range of topics. The book provides step-by-step instructions for set-up and maintenance, with hundreds of detailed photos. The book also includes AR gunsmithing chapters with reviews of recommended tools.
Author Patrick Sweeney is a certified master gunsmith and armorer instructor for police departments. Sweeney has also authored the notable 4-volume Gunsmithing the AR-15 series (Vol. 1, Vol. 2, Vol. 3, and Vol. 4) and 20+ other titles for Gun Digest Books.
Whether you want to learn about disassembling your AR for regular maintenance, field-stripping, swapping out parts, adding optics or customizing a stock, AR-15 Setup, Maintenance and Repair guides you through everything you need to know to keep your AR-platform rifle running well. There are also tips on how to improve accuracy, and maintain your bolt carrier group properly.
Authored by Patrick Sweeney
Published by Gun Digest Books
ISBN-13: 978-1951115470
320 pages, softcover, 8 ¼ x 10 7/8 inches
Editor’s NOTE: The key to keeping an AR running reliably is proper lubrication (in the RIGHT places), and regular cleaning of the bolt carrier and bolt, including ejector recess and extractor recess. The majority of non-functioning ARs we’ve seen had gunk, lube, carbon, and brass shavings in those recesses.
Other AR Books by Patrick Sweeney
Bonus Video — AR15 Maintenance with Jerry Miculek
In this helpful video, legendary shooting Jerry Miculek explains how he cleans and maintains his AR-platform rifles. Miculek shoots ARs in three-gun competitions.
When most shooters think of biathlon, they imagine the winter sport which combines cross-country skiing with rimfire rifle shooting. Now there’s a new type of biathlon, a true “run and gun” competition with rifles and pistols. The Gun Run competitors move on foot over natural terrain, with 5-8 shooting stages over the course, typically 5 km (about 3 miles).
The Gun Run is a two-gun, centerfire biathlon. It is designed to test your physical fitness, marksmanship, and equipment. Competitors will carry their rifle, pistol, ammunition, mags and anything they believe they need to complete the course. They will travel over various distances depending on the match — but most often a 5 kilometer marked course consisting of natural terrain, roads, and trails. There will be anywhere from 5 to 8 shooting stages. There are night events, two-person team events, and even a land navigation event where you must use map and compass to complete the course.
The Gun Run is not a CrossFit competition and it’s not USPSA. This is a challenging event that test personal fitness and marksmanship with both rifle and pistol.
How to Participate in The Gun Run Events
Click below for the list of The Gun Run 2024 Events with links to sign-up pages. The next competition is slated for June 22, 2024 at The Sawmill Tactical Training Complex in Laurens, South Carolina. That event is currently full, but spectators are allowed. The next open event will be held September 28, 2024 at DeWitt’s Outdoor Sports in Ellerbe, North Carolina. Entry fee is $110.
Origins of The Gun Run
This isn’t a new concept … matches like this originated in Texas 20 years ago and have spread all over the country. Prior to that, Colonial Era Americans would gather on the village green sometimes multiple times a week and conduct close order drill with rifle marksmanship competitions. Shooting is as old a past time for this country as this country is old.
Fitness Challenge
Carrying all your gear in 90 degree weather up and down hills is not easy. Having the best gear and being a good marksman can help but having a level of fitness where you can maneuver with gear on is extremely important. The end result of all of this is improving your training plan. Whether it be physical or on the range, every event you compete in should give you areas to work on. Sometimes new kit needs to be bought but most often it is our fitness that needs the most improvement.
Share the post "The Gun Run Competition Combines Marksmanship and Fitness"
The First Shot, the CMP’s archived Online magazine, has an article by Spc. Tyrel Cooper of the U.S. Army Marksmanship Unit (USAMU). In his article, Straight to the Rear, Spc. Cooper describes proper trigger hand and finger positions and how to best “break the shot”. This well-written article will help anyone who shoots off-hand, or who uses an AR or Spacegun-type rifle with a vertical pistol grip.
Cooper explains: “Trigger control is one of the two main principles of shooting that we teach. You can have the best position in the world with perfect sight alignment, but if you have bad trigger control, you have wasted all that effort that you put into your position and sight alignment.”
Photo Credit: CMP image from 2019 CMP 1000 Aggregate at Camp Perry.
Firing Hand Position and Finger Placement
“Good trigger control begins with a good firing hand position. Place your firing hand high on the pistol grip, with a good firm grip. Grip tension should be like giving someone a hand shake or holding a child’s hand while walking across a street. A good firm grip [helps you] move your trigger finger without moving your other fingers. Try this, hold out your firing hand with fingers extended; now try moving your trigger finger to the rear as if you were pulling the trigger. Unless you concentrate very hard on moving just your trigger finger, other fingers will move. Now make a fist as if you were grabbing a pistol grip, now you can move your trigger finger freely without introducing movement in the other fingers.”
“I’m sure you have heard advice to place the tip or the pad of your finger on the trigger. This is true if you have short stubby fingers and that’s where the index finger naturally rests, but if you have long fingers like myself you want more of your finger around the trigger…. By placing your finger where it naturally rests on the trigger you are ensuring that you are pulling the trigger straight to the rear, and this also allows you to get more leverage on the trigger.”
Rapid-Fire Trigger Technique
“Trigger control for the rapid-fire stage is different than it is for standing. You can actually take a little bit more time to break your shots in rapid fire because of the steadiness of a supported position. A good rapid fire shot process is: 1) drop down into position, 2) get your natural point of aim, 3) take up the first stage on your first shot, 4) break that shot smoothly and hold the trigger all the way to the rear through recoil, 4) once recoil has ceased, let the trigger out only far enough to reset the trigger (you should hear a metallic click of the trigger resetting) and continue by firing your second and succeeding shots.
By doing this, you already have most of the weight of the trigger taken up so the next shot is ready to go without having to take up all the weight of the trigger every single shot.”
Slow-Fire Prone Technique
“During the slow fire prone stage, you have even more time to break your shots, so you would use the slow–smooth method. You should have little or no hold movement at all, thus allowing you to acquire good sight alignment, a good sight picture and break the shot using slow and smooth trigger control. Again you want to hold that trigger all the way to the rear until recoil has ceased so you do not disturb the rifle, no matter what position you are shooting.”
Standing Trigger Technique
“When you are shooting standing have you noticed that the rifle never really stops moving? Well, this is where you would want fast and smooth trigger control. When I come down and start settling on the target, I take up the first stage of the trigger. Once I’m getting to the end of my firing process and the movement has slowed down, I manipulate the trigger fast, but smooth, to the rear when I see what I want to see in my sight picture. Over time, this will become a subconscious act; when your brain sees the sight picture, it will automatically tell your trigger finger to move instead of you having to tell yourself there it is, take it. Lots and lots of dry firing will help this process. To repeat, you want to be fast and smooth!”
Do you own or shoot an AR-platform “black rifle”? Then you know these rifles run dirty, and have some unusual maintenance requirements. On the other hand, the AR “Modern Sporting Rifle” is fun and versatile with a vast range of options among buttstocks, barrels, handguards, and grips. You can assemble a simple 16″ barrel .223 Rem rig for home defense, or build a long-barreled 6mm ARC rifle with bag-rider buttstock and high-magnification optic for long range target work. The choice is up to you.
To help with your black rifle journey, here are eight helpful videos from Brownells. These will help ensure your AR rifle cycles reliably and runs longer, with reduced wear. Brownells also explains how to choose the optimal barrel twist rate. CLICK HERE to order AR parts, accessories, and ammo from Brownells.
AR Bolt/Bolt Carrier Lubrication — Smarter Methods
This video shows the proper way to lubricate an AR-15 bolt-carrier assembly. The video identifies the key metal-on-metal friction points where you actually need lubrication: the rails on the underside of the carrier, shiny wear points on top, and just a dab on the cam pin. How much oil/lubricant should you use? The AR-15 is pretty forgiving on that point. Some spots work best with grease, others work best with a lighter oil. Just keep it out of the combustion areas. Those little holes in the carrier are gas vent holes, NOT oil holes!
AR Maintenance — General Cleaning Procedures
Let’s face it, ARs with the original gas system tend to run dirty. You’ll need to regularly clean the bolt carrier and bolt. In addition you should regularly clean the chamber area and the inside of the upper. Also make sure to clean the lower (see video 3:15) and ensure the trigger assembly is properly maintained. This video covers general cleaning and maintenance of AR-platform rifles. We highly recommend that all new AR owners watch this video. NOTE: When cleaning the bolt, don’t forget the extractor recess and ejector recess. The majority of ARs we’ve seen that did not function properly had gunk (lube, carbon, brass shavings) clogging these areas.
AR Barrel Twist Rates — What You Need to Know
AR barrels can be ordered with a variety of twist rates from 1:12″ to 1:7″. Basically, the longer/heavier the bullet you plan to shoot, the faster the twist rate you need. For example, Sierra recommends a 1:7″ twist rate for the 90gr SMK. A 1:12″ could work with the small lightweight bullets up to 55 grains. The 1:9″ barrel will stabilize the light and mid-weight bullets up to about 77 grains. We recommend a 1:8″ or 1:7″ twist rate for the best versatility. You’ll find a detailed discussion of AR twist rates on PewPewTactical.com.
How to Install an AR15 Trigger Assembly
One of the most common AR upgrades done by black rifle owners is swapping out the trigger for a better unit (perhaps a two-stage). Trigger replacements on ARs can be done fairly easily with basic tools. But there are some recommended procedures to ensure the trigger group swap goes easily. You’ll want to have a proper mount to secure the lower, and tools that fit the pin diameters on your lower.
AR Rifle Build — How to Avoid Common Mistakes
This Brownells video explains five common yet serious errors people make while assembling or modifying AR-15 class rifles. Here are the five mistakes all AR builders need to avoid:
1. Mounting Accessories that Contact the Gas Block: A common mistake is attaching accessories like bipods directly to the handguard in such a way that screws exert pressure on the gas block. This misalignment can harm accuracy. The solution involves carefully selecting the attachment point or opting for shorter screws.
2. Incorrect alignment of the Gas Block: This is another widespread issue. Properly aligning the gas block with the barrel’s gas port is essential for the rifle’s reliable operation. Misalignment can lead to cycling problems due to insufficient gas flow.
3. Over-Torquing the Castle Nut: Applying excessive torque to the castle nut can damage the threads of the receiver extension, also known as the buffer tube. The recommended torque setting is 40 foot-pounds. Exceeding this value can compromise the structural integrity of these components.
4. Excessive Material Removal in Upper Receiver Lapping: Removing too much material when lapping the upper receiver, can cause the barrel to sit too far into the upper receiver. This misplacement can affect feed ramp alignment and gas block positioning, potentially leading to functional issues.
5. Improper Buffer Tube Installation: Failing to install the buffer retainer and spring correctly, or screwing the buffer tube in excessively, can obstruct the upper receiver’s closure. Correct installation depth is crucial for these components to perform their intended functions.
Checking Headspace on ARs
In this Tech Tip, Brownells gun tech Steve Ostrem walks users step-by-step through the process of checking headspace on their AR-15 rifles, both new and used. It is very important to have proper headspace to ensure proper feeding and extraction, and to ensure good brass longevity (with less risk of dangerous case separation). Starting at 2:10, this video explains how to check headspace with go/no-go gauges and maximum headspace gauge. Ostrem notes: “If you have an AR that closes on a no-go gauge, we recommend taking it to a gunsmith before heading to the range.”
Excessive headspace in AR platform rifles can lead to dangerous case separation.
Setting Up Gas Tube Systems
This Tech Tip examines AR-platform gas systems, and shows how to select the proper length gas tube, and how to configure multiple tube systems if you change your barrel to different lengths. This is worth watching for anyone re-barreling an AR.
Barrel Gas Block Alignment — Key to Reliable Cycling
In this video, Brownells gun tech Steve Ostrem explains surefire methods to align your gas block. The most common problem with AR builds is poor cycling, commonly caused by misalignment between the gas block and the barrel’s gas port.
Share the post "Saturday Movies: AR-Platform Rifles Set-Up & Maintenance"
Retro is back — at least in the CMP’s Standard Modern Military Rifle AR class. Though Service Rifle competition has evolved to allow optics and heavy barrel profiles, the Standard Modern Military Rifle (AR category) is truly a “blast from the past”. Overall weight is limited to 7.5 pounds, and the rifle must be equipped with iron sights (Rule 5.2.3). In addition, the rifle must “be based on the M-16 rifle or be based on an AR design” with “exterior configuration similar [to] the original military or military-type rifle”. See Rules.
With this in mind our friend Dennis Santiago has put together his own AR-platform Standard Modern Military Rifle for matches run under CMP Games Competition Rules. This is not quite a classic AR, as it has a metal free-float handguard (vs. plastic handguards), but it IS light (7.3 pounds), and it does have iron sights — a key requirement for Standard Modern Military class rifles. CMP Rulebooks — All Classes.
Here is Santiago’s CMP Modern Military Rifle (Standard Class) with an ultralight free float tube that has a titanium barrel nut, and mechanical, center-able front sight. The barrel is an AR-Stoner brand 20″-long 1:7″ Government contour chambered in 5.56×45 NATO. Dennis says: “This makes the 7.5-lb weight limit with a few ounces to spare. We’ll see how well it drives soon enough.”
Dennis explains: “The Standard Modern Military (AR) is a category of military-style rifle that shoots the 200-yard, 30- or 50-shot courses alongside the M1 Garands, Springfields, Vintage, and M1 Carbines. This one boasts a Midwest Industries (MI) ultralight Free-float Handguard and a Yankee Hill folding front sight. Any Government contour or thinner profile rifle-length gas tube barrel with a 0.750″ gas block will work.” Colt makes a suitable Government Contour 20″-long, 1:7″-twist barrel, sold by MidwayUSA.
To test the accuracy of his rifle, Dennis fitted a Mantis-X unit on the top of the float tube. The Mantis-X records the movement of the rifle to interpolate shot placements. Dennis reports: “I spent some extra time at the range grabbing a decent zero for my Modern Military rifle. I stuck a Mantis-X on it to record a few shots shooting offhand at the plates at 200 yards. It drives very easily even with no shooting coat or glove.” The Mantis-X is attached just forward of the carry handle, on top of the MI free-float handguard. The Mantis-X works with live fire as well as dry fire. It communicates via BlueTooth to a smartphone App.
Rifle Shoots Well with 77gr Sierra MatchKings
The gun is presently zeroed with 77gr Sierra MatchKing ammunition. Dennis reports his rifle “can easily hold the X-Ring on an SR target for both 100-yard and 200-yard CMP Modern Military Games matches. And it’s fun to shoot!”
CMP Standard Modern Military Rifle (AR Class)
This rifle is built from carefully selected and fitted parts to conform to the CMP’s 7.5-pound weight limit iron-sighted rifle rule. Officially, this is a CMP Standard Modern Military Rifle, Class “A” (AR type).
1. S&W M&P lower receiver
2. White Oak Armament match upper receiver with 1/4×1/4-MOA pinned rear sights
3. AR-Stoner 20″ 1:7″-twist 5.56x45mm NATO Government contour barrel from MidwayUSA*
4. MidWest Industries ultralight free-float handguard with a Titanium barrel nut
5. Yankee Hill Machine folding front sight with a 0.072″ square front pin
6. RRA 2-stage trigger
7. A2 length buttstock
Easy Rifle Build Using Mostly Existing AR Parts, Plus New Barrel and Free-Float Handguard
Dennis was able to put his Modern Military AR together using components he had collected over the years: “Most of these parts were already in my bin of old AR parts available to be recycled. The barrel and free-float handguard were the only new acquisitions.” And with the AR’s modular format, this was an easy build: “Assembly time was about 30 minutes. I’ve done these parts swaps so many times now.”
Key Rules for Standard Modern Military Rifle (AR Type)
Dennis Santiago’s new AR rifle was built as a “Standard U.S. Modern Military Rifle”, Class A (AR Type), as specified in the CMP Games Competition Rules.
5.2.3 Standard U.S. Modern Military Rifles, Class A
Category A Standard Modern Military Rifles must comply with these requirements:
a) Rifles must be based on the M-16 rifle or be based on an AR design;
b) Rifles must be manufactured by a USA manufacturer;
c) Rifles must be equipped with issue-type metallic front and rear sights; rear sights with adjustments finer than one minute of angle are permitted;
d) Total rifle weight, with sights and without sling, may not exceed 7.5 pounds;
e) Rifles may be fitted with a float tube or free-floating handguard. A nonadjustable sling swivel may be attached to the forward end of the handguard; and…
f) The rifle must be chambered for the 5.56x45mm or .223 Remington cartridge.
Also, from Rule 5.2.2:
a) The exterior configuration of the rifle must be the similar to that of the
original military or military-type rifle;
b) The trigger pull may not be less than 4.5 lbs.;
Comments from other Modern Military Rifle Shooters:
“I built a Modern Military [Standard]. It was tough getting below the 7.5-lb [limit]. I had to carve off a bunch of the 20″ barrel diameter but wanted to stay with it for sight radius (over a 16″). I would just as soon shoot that little iron-sighted rifle at 200 yards as my 15-lb Nightforce-scoped Service Rifle. I love that little rifle.” — Kenneth S.
“I’m building one of these that will make 7.5-lb [Standard Modern Military] weight limit, with the long barrel and long sight radius. This has been on my list this winter.” — Tom K.
“We found that turning down a National Match barrel and taking a few inches off of it made a very accurate rifle.” — Jack A.
“My old (complete) A2 upper has been sitting forlorn on a shelf for a couple of years now. Perhaps I need to do a [Standard Modern Military] build of my own.” — Derek D.
Dennis Santiago replied: “Derek — that’s the reason I was attracted to this. I had bought a brand new WOA A2 pin upper receiver to make a new upper then the scope rule was adopted and it was all flat tops. This gives new purpose to the old parts.”
CMP Rules Defining Modern Military Rifles
Standard vs. Unlimited, Class A vs. Class B
There are actually two different classes of Standard Modern Military Rifles, Class A for AR-type rifles and Class B for other military-style rifles, such as the M1A and FN-FAL. Ok, got that? Now, in addition, there is also a second division for UNLIMITED Modern Military Rifles, again with two classes (Class A — AR-type and Class B — other military rifles). These unlimited rifles can have optics, heavier weights, modern-design adjustable-length stocks, and other upgrades. Here is Rule 5.2.2 from the current CMP Games Rifle and Pistol Competition Rules:
Larry Vickers is a respected firearms trainer who has served with the U.S. Special Operations Forces (SOF). In the course of teaching classes he’s learned that many gun owners waste money on impractical gun accessories. In a well-reasoned Ammoland.com article, “Don’t Be a Tacti-Cool Fool”, Vickers examines today’s trend of over-accessorizing firearms, particularly AR-platform rifles. Vickers doesn’t mince words… he states that too many people are spending too much money on poorly-designed hardware that may be “useless” at best.
Equipment Selection Advice from Larry Vickers
Every class I teach I see and hear students talking about the realization that some things about their gear and shooting in general just doesn’t add up on the range. Everything looks good in a Brownells Catalog but a significant amount of the parts and accessories offered on the market today are: a) useless; b) poorly designed; c) of questionable value; or d) downright dangerous.
No one is better at taking fully-functional, factory-made firearms and turning them into junk than a certain segment of the American gun-buying public.
Some people really don’t apply the common sense approach of not messing with what is potentially a life-saving tool. Sadly some of those same people will get on the Internet and talk bad about how the firearm they modified no longer functions and therefore is junk. Or they will recommend to fellow shooters the same parts and modifications they have used to turn their gun into, at best, a range toy.
Some of this shows up in my classes and usually by lunch on the first day the obvious flaws of the equipment at hand become apparent for everyone in the class, most of all to the owner of said equipment. It may have cost the shooter some money but in turn he learned a serious life lesson –be careful what you read on the Internet about firearms modifications and there is no substitute for shaking out your equipment at the range in a structured class.
I’ve said it before and I’ll say it again: you’ll learn more about guns and shooting in one class than you could in a month on the Internet.
READ about guns, gear, and shooting on the Internet. LEARN about guns, gear, and shooting on the range during well-thought-out and useful training. This approach is proven and consistently produces results and shooter confidence.
In this 51-minute video Larry Vickers responds to questions about gun accessories, his favorite firearms, sensible prepping, and other topics of interest.
Larry Vickers is a retired U.S. Army Special Operations Forces veteran with 20+ years of service. Vickers served in Panama, the Middle East (Desert Storm), Somalia, Bosnia, and other locations. During his time with Delta Force, Vickers worked on weapons R&D, and served as a combat marksmanship instructor training new operational members of Delta.
Share the post "Don’t Waste Money on Tacti-Cool Gear Says Larry Vickers"
MTM offers a black “tactical” Range Box for $50.71 at Midsouth. This black Tactical Range Box includes a special bracket that supports AR-type rifles through the magazine well. As show at right, this is red. However, some previous production models had black magwell brackets (see below).
What Might Be Improved
The 6mm ARC cartridge is a modern 
The 
