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July 3rd, 2022

Sunday Gunday: M1 Garand for America’s July 4th Weekend

CMP Civilian Marksmanship Program M1 Garand Christmas Rifle

Tomorrow is July 4th, our nation’s birthday. To mark this important day in American history, we are featuring a great American military rifle, the M1 Garand, a rifle General George S. Patton called: “the greatest battle implement ever devised”. We think every serious vintage rifle collector should acquire an M1 Garand at some point.

CMP Civilian Marksmanship Program M1 Garand Christmas Rifle

The CMP has, in the past couple of years, received over 90,000 Garands from overseas arsenals, so there are plenty to be had currently. This article explains how to order an M1 Garand from the CMP, and how to select the right grade for your needs and budget.

How to Order an M1 Garand from the CMP
To purchase an M1 Garand through the CMP, you must be an adult U.S. Citizen, and a member of an affiliated organization who has participated in a “Marksmanship Activity”. This basically means you need to join a gun club and participate in a clinic or match. Proof of club membership and citizenship is mandatory for all ages. However, the marksmanship requirement is waived for those over 60 years of age. Garands must be ordered by mail or through official CMP Auctions. CLICK HERE to Start Order.

Garand Turkish Turkey Philippines

CLICK HERE for Garand Ordering Information | CLICK HERE for Eligibility Requirements

CLICK HERE for Garand Grading Information

Here are two videos that explain the procedure for ordering an M1 Garand from the CMP. Along with mail-order sales, the CMP has brick-and-mortar stores where M1 Garands can be inspected and purchased and then transferred via your FFL (in compliance with state law). The three CMP stores are located in Anniston, Alabama; Talladega, Alabama; and Port Clinton (Camp Perry), Ohio.

CMP marksmanship program M1 Garand store order rifle vintage .30-06

M1 Garand Barreled Actions and Aftermarket Barrels

CMP Civilian Marksmanship Program M1 Garand Christmas Rifle

Along with complete M1 Garand rifles, the CMP also offers barreled actions. This can save you money, and also makes sense if you are looking to create a rifle with high-grade wood, or you want to bed the action for improved accuracy. You can order an M1 Garand barreled action, as well as complete M1 Garand rifles, from the Civilian Marksmanship Program (CMP). The eligibility requirements and ordering process will be the same for a barreled action as for a complete rifle.

If you already have an M1 Garand, but need a new barrel, you can order a pre-chambered Criterion barrel in .30-06 Springfield. Criterion tell us: “This is a direct replacement barrel for the M1 Garand rifle, manufactured to Mil-spec print #6535448. It has the original G.I. contour and Parkerized finish. Receiver threads are timed, all milling cuts are made, and all M1 Garand barrels are hand-lapped.” NOTE: Each barrel is .010 short-chambered and should be headspaced by a qualified gunsmith. These Criterion .30-06 replacement barrels, priced at $295.00, are legal for use in Service Rifle and John C. Garand matches.

How to Maintain the M1 Garand Rifle

CMP Civilian Marksmanship Program M1 Garand Christmas Rifle

Once you have an M1 Garand in your collection, you’ll want to keep it in tip-top condition so it works flawlessly for vintage military matches and fun shooting. Below we’ve linked two good SSUSA articles on M1 Garand maintenance. Following that you’ll find two excellent videos covering M1 Garand Disassembly, Cleaning, and Lubrication. Finally there are links to recommended print manuals for the M1 Garand.

M1 Service and Maintenance
Shooting Sports USA (SSUSA) published an excellent article on Service and Maintenance of M1 Garand Rifles. This offers some smart tricks, such as using smoke from burning masking tape to darken the front sight post. There is also an older SSUSA article that covers basic cleaning and servicing and also explains how to upgrade the performance of your Garands. READ Article HERE.

M1 Garand maintenance procedures

As a resource for Garand owners, SSUSA recommends GarandGear.com: “[At] Garand Gear you’ll find USGI spec parts, tools, gauges, clips and a few Garand accessories. They also have some interesting freebies, most notably a direct analysis of M1 gas port pressures produced by different brands of commercial .30-06 ammunition, showing which ones exceed M2 Ball pressure, as well as the pressures produced by ammo manufactured specifically for the M1 Garand, such as Hornady’s M1 Garand Match and Federal’s American Eagle M1 Garand. Here you’ll also find free, downloadable and printable PDF copies of War Department M1 Garand maintenance manuals TM9-1275 and TM9-1005.”

m1 Garand Rifle Barrels CMP Criterion

M1 Garand Disassembly, Cleaning, and Lubrication

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July 3rd, 2022

6mm ARC Cartridge — SAAMI Specs, Components, Videos

6mm ARC brownells bolts cartridge loaded ammunition hornady

In June 2020, Hornady introduced the 6mm ARC, a new SAAMI cartridge optimized for AR-platform rifles*. The new 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.

CLICK Image for official SAAMI Specifications:
6mm ARC brownells bolts cartridge loaded ammunition hornady

If you are intrigued by the 6mm ARC, you’ll find the products you need at Brownells — uppers, barrels, bolts, and magazines. Brownells also sells Hornady-made 6mm ARC factory-loaded ammo, but most varieties are out-of-stock right now, as is the 6mm ARC brass. More brass and ammo should arrive soon. Midsouth is also taking brass/ammo backorders. For general information, see 6mm ARC Info Page.

What Is the 6mm ARC Cartridge?
6mm ARC brownells bolts cartridge loaded ammunition hornadyThe 6mm ARC cartridge is a new 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

For more INFO, see 6mm ARC Info Page.

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 the magazines that have been designed for 6.5 Grendel. All the hardware you need is currently available at Brownells.

6mm ARC brownells bolts cartridge loaded ammunition hornady

6mm ARC Videos from Hornady (18 Total)

6mm ARC: Overview
6mm ARC: Handloading
6mm ARC Initial Offerings
6mm ARC: AR-15 vs AR-10
6mm ARC vs. 6.5 Grendel
6mm ARC vs the Creedmoors
6mm ARC: 6.5 Creedmoor of the Gas Gun World
6mm ARC vs 308 WIN
6mm ARC: How it started

6mm ARC: What is it
6mm ARC: Military Application
6mm ARC vs. 6.8 SPC
6mm ARC: Bolt Gun Application
6mm ARC: Cartridge Design
6mm ARC: Best AR-15 Cartridge
6mm ARC: Hunting
6mm ARC: Match
6mm ARC: Barrel Length


* While 6-6.5 Grendel shooters are known to run stout pressures, the new 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.

Permalink - Articles, - Videos, Bullets, Brass, Ammo, Gear Review, Tech Tip 1 Comment »
July 3rd, 2022

Rossi RS22 — Exceptional Bargain Rimfire Rifle for $119.99

Rossi rs22 RS 22 .22 LR training rifle Mossberg

Looking for a very affordable first rifle? Or maybe you’re equipping a Scout troop with rimfires for marksmanship training. Here’s one of the best low-cost options you can find among .22 LR rimfire rigs. The Rossi RS22 is a reliable, semi-auto rifle that comes equipped with barrel-mounted iron/fiber optic sights. There are also dovetails on the receiver for mounting scope rings. The RS22 also takes most Mossberg 702 magazines.

This Rossi RS22 is a great bargain right now. As part of its Fourth of July Sale, Palmetto State Armory is offering this fun little RS22 rifle for just $119.99.

The Rossi RS22 features an 18″ free-floating barrel, adjustable fiber optic sights and a synthetic Monte Carlo stock. For added accuracy, 3/8″ dovetail mounts allow the mounting of a scope or other optic.

Rossi RS22 Specifications:

Model: RS22 Semi-Auto, .22 LR
Barrel: 18″ Free-floating
Stock: Black Monte Carlo Synthetic Stock
Overall Length: 36.25″
Weight: 4.1 lbs.
Scope Mount: 3/8″ Dovetail
Sights: Fiber Optic Front & Rear
Safety: Manual Cross-Bolt Safety
Magazine: 10-rd Detachable Box Mag


NOTE: The Rossi RS22 on sale has a matte black stock.

Rossi rs22 RS 22 .22 LR training rifle MossbergTwo Video Reviews of Rossi RS22
The above video review of the Rossi RS22 confirms its reliability and build quality. The reviewer praised the fiber-optic iron sights and liked the magazines. After fitting a scope to the rifle’s built-in dove-tail, the tester got excellent accuracy with CCI ammo at 25 yards. Ten shots basically formed one half-inch hole. (See video 8:24 – 8:50 and target at right.) That’s good enough for an NRL22 match. Pretty impressive for a $120 rifle!

Gunblast.com also tested the Rossi RS22. This “dandy little rifle” performed great, with flawless semi-auto feeding and cycling for hundreds of rounds. Accuracy was quite good. The tester praised the fit and feel of the stock and noted it has sling swivel studs and well-protected sights. The RS22 can also use 25-round Mossberg magazines.

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July 3rd, 2022

Varminters’ Debate — Cranking Elevation or Holding Over/Under

IOR Scope elevation knob one revolution

Leuopold Varmint Hunters' ReticleA varmint shooter’s target is not conveniently placed at a fixed, known distance as it is for a benchrester. The varminter must repeatedly make corrections for bullet drop as he moves from closer targets to more distant targets and back again. Click HERE to read an interesting Varmint Forum discussion regarding the best method to adjust for elevation. Some shooters advocate using the scope’s elevation adjustments. Other varminters prefer to hold-over, perhaps with the assistance of vertical markers on their reticles. Still others combine both methods–holding off to a given yardage, then cranking elevation after that.

Majority View — Click Your Scope
“I zero at 100 yards — I mean really zero as in check the ballistics at 200 and 300 and adjust zero accordingly — and then set the scope zero. For each of my groundhog guns I have a click chart taped into the inside of the lid of the ammo box. Then use the knobs. That’s why they’re there. With a good scope they’re a whole lot more accurate than hold-over, with or without hash marks. This all assumes you have a good range finder and use it properly. If not, and you’re holding over you’re really just spraying and praying. Try twisting them knobs and you’ll most likely find that a 500- or 600- or 700-yard groundhog is a whole lot easier than some people think.” — Gunamonth

Varmint hunter 22 BR elevation scope hold-over

“I have my elevation knob calibrated in 100-yard increments out to 550. Range-find the critter, move elevation knob up…dead critter. The problem with hold-over is that it is so imprecise. It’s not repeatable because you are holding over for elevation and for wind also. Every time you change targets 50 yards, it seems as if you are starting over. As soon as I got completely away from the hold over method (I used to zero for 200), my hit ratios went way up.” — K. Candler

“When I first started p-dog shooting, I attempted to use the hold-over method with a 200-yard zero with my 6mm Rem. Any dog much past 325-350 yards was fairly safe. I started using a comeups table for all three of my p-dog rifles (.223 Rems and 6mm Rem). 450-yard hits with the .223s are fairly routine and a 650-yard dog better beware of the 6mm nowadays. An added benefit (one I didn’t think of beforehand) with the comeups table (elevation only), is that when the wind is blowing, it takes half of the variables out of the equation. I can concentrate on wind, and not have to worry about elevation. It makes things much more simple.” — Mike (Linefinder).

“I dial for elevation and hold for wind. Also use a mil-dot reticle to make the windage holds easier. For windage corrections, I watch for the bullet strike measure the distance it was “off” with the mil-dot reticle, then hold that much more the other way. Very fast once you get used to it.” — PepeLP

Varmint Hunting ScopeMinority View — Hold-Over is Better
“I try to not touch my knobs once I’m zeroed at 200 meters. Most of my varmint scopes have duplex reticles and I use the bottom post to put me on at 300 meters versus turning knobs. The reason I try to leave my knobs alone is that I have gone one complete revolution up or down [too far] many times and have missed the varmint. This has happened more than once and that is why I try not to change my knobs if at all possible.” — Chino69

“I have been using the hold over method and it works for me most of the time but the 450 yards and over shots get kinda hard. I moved to a 300 yard zero this year and it’s working well. I do want to get into the click-up method though; it seems to be more fool-proof.” — 500YardHog

Compromise View — Use Both Methods
“I use both [methods] as well — hold over out to 250, and click up past that.” — Jack (Wolf)

“I use the target knobs and crank-in elevation. I also use a rangefinder and know how far away they are before I crank in the clicks. I have a scope with drop dots from Premier Recticle and like it. No cranking [knobs] out to 600.” –Vmthtr

Permalink Hunting/Varminting, Optics, Shooting Skills 1 Comment »
July 2nd, 2022

Saturday at the Movies: Precision Rimfire Rifles & Competitions

MARS modern american rimfire series tactical NRL22 sunday gunday Center-X PRS .22 David Luu

Rimfire tactical-style matches are now one of the fastest-growing types of rifle competition in the country. The USA has seen a big growth in rimfire tactical matches over the last five years. NRL22 and PRS Rimfire matches are held throughout the country. Right now there are probably ten times as many rimfire tactical matches as sanctioned PRS and NRL centerfire matches. The reason is simple — rimfire ammo is much less costly, and clubs can run challenging rimfire tactical matches at nearly any outdoor gun range that allows shooting out to 200+ yards.

The National Rifle League (NRL) started off sponsoring major centerfire tactical matches, similar to PRS competitions. That proved successful so the NRL added a .22 LR Rimfire series, called NRL22. The NRL22 rimfire discipline has been a major success, as rimfire guns are fun to shoot and ammo is very affordable. The most popular NRL22 matches have drawn up to 200 rimfire competitors. And now PRS has its own PRS .22 Rimfire series. The big NETT PRS .22 match in Terrell, Texas takes place today July 2, 2022.

Precision Rimfire Match with Through-the-Lens Video

Here’s an interesting video featuring a top-tier .22 LR MDT-chassis rifle. The host, Pieter “Piet” Malan from South Africa, runs the excellent Impact Shooting YouTube Channel, which now has 320+ videos on target shooting and hunting. This video features a TriggerCam unit attached to the scope, so you can see hits on the targets, just as the shooter does.

rimfire precision .22 LR NRL 22 PRS Piet South Africa

NRL22 — Affordable, Challenging Rimfire Competition Series

NRL22 is a great way to get into competition shooting with minimal expense. There are five (5) classes: Open, Base, Ladies, Young Guns (8-16) and Air Rifle. Base Class is for the budget-minded shooter — the combined MSRP of Rifle and Optic may not exceed $1200.00 (so you could spend $700 on a rifle and $500 on a scope for example). That keeps the sport affordable. Open, Youth, and Ladies Classes have no price limits on Rifle and Optic. Visit NRL22.org to find an NRL22 match near you.

Precision Rimfire Competition Match Report

This excellent video covers a big rimfire precision match, the King of 0.28 Miles event, held at the Rush Lake Range in MN. The video shows multiple stages with targets out to 300 yards, followed by a 465-yard challenge. Host Dave shot the match with a Vudoo Gunworks V22 rifle in a Grayboe Ridgeback stock, with a Trijicon Accupower 4.5-30x56mm FFP scope. The ammo was Lapua Center-X, a top-tier choice.

Introduction to the .22 LR Rimfire Precision Game

The Modern American Rimfire Series (MARS) was created to offer “a practical/tactical event” that could be shot at modest distances. David Luu founded MARS (intially as the Mid-Atlantic Rimfire Series) to provide PRS-type competition at shorter ranges with more affordable ammo. Though the distances are shorter, the challenge remains: “Shooting a .22 LR at 200-yards is like shooting a .308 at 1,000-yards”, Luu told Guns.com. In this video, to help beginners get started, Luu provides a shortlist of beginner tips and tricks for rimfire PRS. The lead photo in this article come from the MARS website.

Rimfire Ammo Selection — Why Comparison Testing Is Important

Every gun and barrel is different, so you should test various ammo types in YOUR rifle. Additionally, you can benefit from lot testing with particular ammo types to optimize your ammo choice even more. If you’re serious about rimfire accuracy, lot testing can be very helpful, whether at your own rage or a testing center. There is no replacement for starting with a good lot of ammunition your rifle likes.

First Rimfire Precision Match — Lessons Learned

Here’s a helpful video for folks getting started in the Precision Rimfire game. Our buddy F-Class John, a top F-Open competitor (and YouTube video creator), is getting starting in the .22 LR precision discipline. Here he provides lessons learned from his first .22 LR precision match.

Tripod Review — Options for Precision Rimfire Shooters

In this video, Joshua Thomas reviews an excellent, affordable full-size shooting tripod for rimfire precision matches. You’ll find many more honest and informative gear reviews on the Pursuit of Accuracy YouTube channel. And on Joshua’s website, Pursuitofaccuracy.com, you’ll find gear recommendations and free downloadable targets. Last fall, Joshua’s CZ 457 precision rimfire rifle was featured in our Bulletin.

free prs nrl target factory pursuit accuracy

jonathan Ocab v-22 vudoo action MPA BA Comp chassis rimfire tactical NRL22 sunday gunday Center-X 6mm creedmoor PRS

The NRL22 match format is a great shooting discipline. NRL22 offers a high fun factor at relatively low cost. You don’t have to reload match ammo. A couple of 50-round boxes of .22 LR ammo will get you through the match. While some people bring lots of gear to matches, that’s by choice and not by necessity. You can keep it simple and still be competitive (and win).

Tips for NRL22 Competitors
by Jonathan Ocab
I am a match director at my gun club and run our local NRL22 matches. People often ask me for tips for competing in NRL22. First, I recommend getting the course of fire for the month in advance and practicing those stages at the range. Here are other specific tips that should help NRL22 competitors improve their gun-handling and match results.

1. Dry Fire Practice — If you are not able to do live fire practice at the range, I encourage shooters to practice their shooting positions at home via dry fire. Setup props or barricades with pasters or other faux targets on a wall in the garage or inside the house and run through each stage.

2. Scope Magnification Level — The most common issue I see with newer shooters in NRL22 is the tendency to maximize their scope magnification. The timer will start, and the shooter gets into position on a target, but the scope is set to 15x or higher and the shooter can’t find the target. The shooter lowers the magnification, locates the target, and then increases the magnification again, takes the shot, transitions to another target, and repeats the process of decreasing magnification, locating target, etc. Novice NRL22 shooters should try using the mid-range magnification. Try shooting 7x-12x and learn to balance field of view and target image.

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July 2nd, 2022

LEE Breech Lock Hand Press — Versatile, Affordable, Portable

Lee breech lock hand press kit
The LEE Hand Press Kit comes complete with: Breech Lock Hand Press, Ram Primer fittings, Powder Funnel, Case Lube, and one Breech Lock Quick Change Bushing.

The LEE Breech Lock Hand Press is a useful addition to any reloader’s tool collection. This Hand Press allows you to resize brass or seat bullets while at the range or away from your loading room. No it won’t replace your Co-Ax or Rockchucker, but this is a handy piece of gear. And it’s very affordable. Midsouth sells the LEE Breech Lock Hand Press Kit, with everything shown above, for $58.89. Or you can buy just the Hand Press by itself for $42.22 at Battlehawk Armory. That’s a great deal.

Lee breech lock hand press kitLEE Hand Press Quick-Change Die Functionality
This LEE Press includes the Breech Lock Quick-Change Die Feature, so you can instantly change dies with just a twist of the wrist. One Breech Lock Quick Change Bushing is included. The Breech Lock Hand Press is light and compact. It tips the scale at a mere 1 3/4 pounds and overall product length is 11.5″. Note: the maximum overall length cartridge the LEE Hand Press can accept is 3.650 inches.

While we don’t recommend the Hand Press for major full-length sizing chores, it does a good job seating bullets. This makes it a handy “field expedient” tool when doing load development at the range. For example you can experiment with seating depth by loading a batch of cartridges at home with the bullets deliberately seated long. Then, at the range, you can re-seat the bullets progressively shorter (in a series of rounds), until you find the optimal Cartridge OAL.

LEE’s Hand Press is also great for decapping operations. One verified buyer reports: “I mostly use it for decapping while watching TV, with a universal decapper die. Of course it is also useful for other operations. I wouldn’t love sizing large rifle cases with it, but if you’ve prepped your cases on a bigger press you could comfortably take it to the range for load development, one round at a time, working right there at the line instead of making a bunch of loads at home that you’ll have to disassemble later. It’s smaller and more lightweight than it looks[.]”

Using LEE Hand Press to Load at the Range
To learn more about using the LEE Hand Press in the field with a compact scale, read Reloading Without a Bench on GunsAmerica.com. Author Christopher Mace explains: “whether you want a better way to do load development, the capability to reload out of your ‘bugout bag’, or you’re short of space but wanting to get into reloading, the LEE Loaders and the LEE Hand Press offer you some options.”

Reloading Lee hand press review GunsAmerica

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July 1st, 2022

Choosing the Optimal Neck Bushing Size — Tips from Whidden

John Whidden Dies Neck Bushing diameter reloading

Whidden Gunworks makes great sizing and seating dies. The Whidden full-length sizing die with neck bushing is very popular because it allows you to “tune” the neck tension by using different bushings, with larger or smaller inside diameters. In this video, John Whidden explains how to choose a the right bushing size for use with your neck-sizing and full-length sizing bushing dies.

For most applications, John suggest starting with the caliper-measured outside diameter of a loaded cartridge (with your choice of bullet), and then SUBTRACT about three thousandths. For example, if your loaded round mics at .333, then you would want to start with a 0.330 neck bushing. John notes, however, that you may want to experiment with bushings, going down a thousandth and up a thousandth. With thin In addition, as your brass ages and the necks harden, you may want to change your bushing size.

John Whidden Dies Neck Bushing diameter reloadingQuick Tip: Try Flipping Your Bushings
You may also want to experiment with “flipping” your neck bushings to alternate the side that first contacts the neck of the case. (One side of the bushing is usually marked with the size, while the other side is unmarked.) So try “number side up” as well as “number side down”.

Some folks believe that one side of the bushing may allow a smoother entry, and that this can enhance concentricity. Other people think they can get very slightly more or less neck tension depending on how the bushing is oriented. This is a subtle effect, but it costs nothing to experiment.

If one bushing orientation proves better you can mark the “up” side with nail polish so that you can always orient the bushing optimally. NOTE: We have confirmed that some bushings are actually made with a slight taper. In addition, bushings may get distorted slightly when the brand name and size is stamped. Therefore there IS a reason to try both orientations.

Permalink Bullets, Brass, Ammo, Reloading, Tech Tip 1 Comment »
July 1st, 2022

Weaver Rail vs. Picatinny Rail — What Are the Differences?

Picatinny Rail specifications 1913 Mil-std

Readers often ask “What’s the difference between a Weaver scope rail and a Picatinny Rail?” The answer is not as simple as it seems. The dimensions of a Picatinny Rail should be consistent (from one rail-maker to another), since there IS a government spec. Conversely, there is some variance in “Weaver-style” rails. The width of the groove is the most important difference between Picatinny Rails and Weaver-type rails. “Mil-spec” Picatinny rails will have a grove width of 0.206″ while Weaver rails typically have a narrower, 0.180″ groove width.

Weaver Rail BAT action
Does your rifle have a Weaver Rail or Picatinny Rail? Check the dimensions to be sure.

Brownell’s has a helpful GunTech™ Article that discusses the Picatinny Rail vs. Weaver Rail. That article explains:

What are the differences between the ‘Picatinny’ and the ‘Weaver’ systems? The profile of the two systems is virtually identical. Depending on the quality of the machining done by the manufacturer, the two systems should be indistinguishable from the profile. The key difference lies in the placement of the recoil grooves and with width of the grooves. MIL-STD-1913 (Picatinny) grooves are .206″ wide and have a center-to-center width of .394”. The placement of these grooves has to be consistent in order for it to be a true Picatinny MIL-STD system. Weaver systems have a .180” width of recoil groove and are not necessarily consistent in a center-to-center measurement from one groove to the next.

In many instances, a Weaver system has a specific application that it is machined for, so interchangeability is not necessarily an issue. A MIL-STD-1913 system must adhere to the specifications listed above in order for it to be considered MIL-STD, since the military desires uniformity in the recoil grooves to allow for different systems to be mounted on the weapon with no concern for compatibility.

Now, what does this mean? Boiled down, it means that accessories designed for a Weaver system will, in most cases, fit on a Picatinny system. The reverse, however, is probably not the case. Due to the larger recoil groove, Picatinny accessories will not fit a Weaver system. There are, of course, exceptions to every rule, but for a good rule-of-thumb, [full-width] Picatinny won’t fit Weaver, but Weaver accessories WILL fit Picatinny.

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