Forum member Jacob spotted this simple, but effective set of scope ring inserts on the Brownells Website. With these inserts, you can use a scope with 1″-diameter main tube in 30mm rings. Non-marring, matte black Delrin sleeves surround the scope tube so it can fit larger-diameter rings. Each sleeve comes in two parts for easy installation around your scope tube. This way you can use the same 30mm rings for all your scopes.
Ring Reducers are sold as front/rear kits. Cost is $16.99 for the Delrin 30mm to 1″ converters, item 084-000-091WB. There are also sets that reduce 30mm rings to 26mm, and 1″ rings to 3/4″ or 7/8″.
Note: These Brownells units simply function as plastic bushings. Unlike Burris Signature Ring inserts, they do not allow you to “pre-load” windage or elevation. If your rings are misaligned, the Brownells Ring Reducers won’t correct that problem.
One of the CMP’s most popular competitions is the M1 Carbine Match. The little carbines are easy to hold and easy to shoot, with relatively low recoil compared to an M1 Garand or M1903 shooting the full-power .30-06 cartridge. Unfortunately, genuine GI-issue M1 Carbines are now hard to find at affordable prices. The CMP has announced: “CMP’S Carbine Inventory has been exhausted and we do not expect to receive any additional shipments.” Authentic surplus U.S. Military M1 Carbines are selling for $1600 to $3500 these days on Gunbroker.com.
For Android users, there is a FREE App which shows How the M1 Carbine works. This complements the YouTube Video linked above. The App creator, Noble Empire, has 21 more illustrative Apps for other firearms, including the M16, M1911 pistol, 9mm Uzi, FN SCAR and more.
Over the years, the CMP has offered several different grades of M1 Carbines, from serviceable to excellent condition. Inventories have been shrinking in recent years, but now and then the CMP is offers M1 Carbines on its CMP Auction website. Prices start at about $1500.00 for Service Grade, with rare Unissued Models commanding $3000 or more. More information can be found on the CMP’s M1 Info Page.
Good Hickok45 Video with Genuine WWII Era M1 Carbine produced by Standard Products
There is an excellent history of the M1 Carbine (all versions) on the Pew Pew Tactical website. There are many historical photos, along with videos of two M1 Carbine variants being tested in the field.
The first M1 Carbines were delivered in mid-1942, with initial priority given to troops in the European theatre of war. According to the CMP: “The M1 Carbine was designed primarily to offer noncombat troops a better defensive weapon than a pistol or submachine gun, with greater accuracy and range, but without the recoil, cost, or weight of a full-power infantry rifle. The carbine was also easier for less experienced soldiers and smaller-framed people to fire than the .30 caliber infantry rifles of the day. The carbine was more convenient to carry for officers, NCOs, or specialists encumbered with weapons, field glasses, radios, or other gear. Tankers, drivers, artillery crews, mortar crews, and other personnel were also issued the M1 Carbine in lieu of the larger, heavier M1 Garand. Belatedly, a folding-stock version of the M1 Carbine was developed, after a request was made for a compact and light infantry arm for airborne troops.”
CMP M1 Carbine Matches — Fun with an Easy-to-Handle Rifle
CMP M1 Carbine Matches — Growing in Popularity
The CMP M1 Carbine Match is part of the CMP Games program that already includes Garand, Springfield and Vintage Military Rifle Matches. “As-issued” U. S. Military M1 Carbines are fired over a 45-shot course of fire at 100 yards on either the old military “A” target or the “SR” target. The course includes 5 sighters and 10 shots for record prone slow fire in 15 minutes, a 10-shot rapid fire prone series in 60 seconds, a 10-shot rapid fire sitting series in 60 seconds and 10 shots slow fire standing in 10 minutes.
CMP M1 Carbine Match at Western CMP Games
A good intro to M1 Carbine features, this video has over 6.7 million views on YouTube.
New Production M1 Carbines
Thankfully, you don’t need to source a real WWII-era M1 to enjoy CMP M1 Matches. You can now get a brand new, American-made M1 Carbine clone significantly less than the price of old CMP rifle. Sportsman’s Warehouse sells American-made KAHR Auto Ordnance .30-Caliber M1 Carbines that look, feel, and shoot just like the originals, for a lot less money. There are two versions:
Auto-Ordance is now part of the KAHR firearms group. These Auto Ordnance M1 Carbines are currently out of stock at many vendors, but we expect them to be available later this year.
Another producer of M1 Carbine replica rifles is Inland Manufacturing, a modern company which shares the name of a leading WWII M1 Carbine maker. These made-in-the-USA, newly manufactured M1 Carbines are very authentic copies of the original carbines from the World War II era. With a $1139.00 starting MSRP, they feature authentic 1944-type adjustable sights, push button safety, round bolt, “low wood” walnut stock, and a 10–round or 15-round magazine. There are three (3) versions: M1 1944 style, M1 1945 style, and M1A1 Paratrooper model.
GunsAmerica.com report compares new Inland M1 Carbines side-by-side with original vintage M1 Carbines: “We had to get in close to tell the difference. Overall, the two examples we were able to handle looked great and held up when next to the originals. The stampings are even close to correct with a few minor differences that were chosen to stop the new Inlands from being mistaken for originals. Take a look at the photos and see for yourself.” READ M1 Carbine Review.
Inland Firearms M1 Carbine Shooting Demonstration by Hickok45
This article is Copyright 2023 AccurateShooter.com. No republication is authorized. Any appearance of this story on another site obliges that site to pay liquidated damages and licensing fees.
Need a top-notch Ballistics App for your iPhone, iPad, or iPod? Start with Ballistic: Advanced Edition (AE), the number 1 (i.e. most installed) App for iOS systems (iPhones and iPads). Ballistics AE (Advanced Edition) is the most popular iOS ballistics program for many good reasons. It offers a full feature set with Ballistic Solver, Ballistic Comparison (with up to 8 projectiles), Target Log (records group sizes), Advanced WindKit, and more. The Ballistic: Advanced Edition software is easy to use, with nice controls. Underneath it all is the proven JBM Ballistics calculator. And here’s the kicker — this excellent mobile App software is now FREE to download and install on iPhones and iPads!
This Video Explains How to Set Up and Use Ballistic: Advanced Edition
Full-featured and easy to use, Ballistics AE has been refined over many years, and it supplies rock-solid solutions derived from JBM Ballistics solver (created by James B. Millard). Unlike some other Apps, Ballistics AE is STABLE on iPhones (with various OS levels). What’s cool is that Ballistics AE is now available for FREE for both iPhones and iPads. This software is now provided by Federal Premium Ammunition, with in-App purchase functionality.
We’ve used the Ballistic: Advanced Edition program on an iPhone 5S, iPhone 6, and iPad, and it performed well. Here are some of the features we liked:
1. Mirrors output from online version of JBM Ballistics we often use for initial calculations.
2. Controls are simple to use and (mostly) intuitive.
3. Handy comparison feature lets you compare ballistics for different projectiles side by side.
4. Advanced Wind Kit allows you to account for complex wind situations.
5. Projectile and BC Databases are very comprehensive.
6. Software is regularly updated to match Apple OS changes.
This article is Copyright 2023 AccurateShooter.com. No republication is authorized. Any appearance of this story on another site obliges that site to pay liquidated damages and/or licensing fees.
Want to see new-born Pandas? No, not the furry kind — rather Stolle Panda actions produced with state-of-the-art CNC machinery. If you’ve ever wondered how precision benchrest, long-range, and tactical rifles are built, check out video from Kelbly’s. You’ll see actions finished, barrels chambered and crowned, pillars installed in stocks, barreled actions bedded, plus a host of other services performed by Kelbly’s gunsmiths and machinists.
If you’re a fan of fine machine-work, this video should be both informative and entertaining. You can see how precision gun work is done with 21st-Century technology. Tip of the hat to Ian Kelbly and crew for producing this excellent video visit to the Kelbly’s production center.
Click Volume Control to Activate Sound for Kelbly’s Video:
To optimize your loads and to generate precise ballistics tables, you need a quality chronograph. Having precise readings of bullet muzzle velocities lets you calculate ES and SD to determine the most repeatable load with least vertical dispersion. Very accurate velocity data is also essential to created a precise drop table for long range and to predict the effect of winds. There are many good chronographs on the market, ranging in price from around $100 to $1000, not counting tripods.
Today’s Saturday Movie showcase features a variety of modern chronographs. We include comparison tests, as well as video reviews of the new, small-format Bulletseeker Mach 4 and AndiScan Micro A2 Doppler Radar chronographs. If you are in the market for a new chronograph and have the resources, you should definitely consider one of these new small chronos, which are easy to set-up and can be mounted directly to your rifle. For those with a limited budget, MagnetoSpeeds still offer great performance for the price. However, you may have to conduct load tuning separately with the MagnetoSpeed removed.
Triple Chronograph Comparison Test
LabRadar, MagnetoSpeed, and Shooting Chrony Alpha Master
This video has an interesting comparison test with three chronograph devices operating at the same time. A Shooting Chrony Alpha Master unit was set up downrange, while a modern LabRadar was placed to the right side of the rifle. On the barrel of the rifle a MagnetoSpeed chrono was attached. This allowed the tester to compare shot velocity values from all three chrono systems at the same time. The video creator explained: “I was curious to see if my old [Shooting Chrony] chronograph could still give me useful velocity information compared to using the newer MagnetoSpeed and LabRadar.”
Chronograph Functions and Features — Vortex Nation Podcast
In this 78-minute video, experts from Vortex explaining how modern chronographs work. The discussion covers the technical features of various chronographs. Multi-time F-Class National Champion Ian Klemm and former sniper Tony Palzkill examine different chronograph types, explaining how they operate. Ian discusses the pros and cons of different chronograph designs, and provides many good tips for chronograph owners. This 78-minute discussion covers multiple chronograph designs, including LabRadar, MagnetoSpeed, and Caldwell Ballistic Precision. There is also extensive discussion of ballistics in the first 20 minutes.
MagnetoSpeed vs. Caldwell Ballistic Precision Chronograph
In this video the host compares a MagnetoSpeed with an older, first generation Caldwell Ballistic Precision Chronograph, mounted a few yards downrange on a tripod. The tester favored the Magnetospeed saying it was “incredibly accurate” while being much easier to set up and transport. He also says the MagnetoSpeed App was very “user-friendly”.
NOTE: Skip Forward to 5:40 to see the Bulletseeker field-tested as mounted on rifle and on tripods.
The Bulletseeker Mach 4 is a new radar chronograph that mounts directly to your rifle. The advanced Bulletseeker features 120 Ghz radar with a beam-forming lens. Developed in Europe, with made-in-Germany core components, this unit is sold in the USA for $999.00 by Longshot, trusted maker of long-range target cameras. We think this is a game-changer. You get advanced radar ON YOUR GUN, with no need to haul around a bulky LabRadar.
Comparison test with the Bulletseeker Mach 4 and LabRadar
Another Bulletseeker tester was very impressed: “Based on my experiences with the device it seems like a good product that does everything it advertises. All the benefits of a LabRadar without the drawbacks.” (SEE Product review HERE.)
In this video, our friend F-Class John tests the innovative, ultra-compact AndiScan Micro A2 Doppler radar chronograph. This unit is small enough that it can be fitted to your rifle, or attached to a front rest or mini tripod. John tested an early pre-production model. The production model is now available for 800 Euros on the SQI-AndiX eShop. The manufacturer notes: “The next large 2023 production series is expected to be ready by the end of February.”
Product Description: “The AndiScan Micro A2 is an advanced ballistic velocity Doppler radar for measuring muzzle velocity of projectiles. It operates in 24GHz frequency band. It is a highly integrated and extremely small form-factor device that is intended to be directly mounted on the rifle. This frees the user from a complicated setup alignment and it also allows to perform measurements under dynamic conditions. It is the first device [with] this form-factor on the public market.”
JKL Inertial Trigger for LabRadar
The JKL Inertial Trigger for the LabRadar is an easy-to-use, inertial-driven trigger that activates simply from the recoil of your gun. Rather than activate by sound or Doppler reading, the JKL Trigger works from the rifle’s instantaneous recoil pulse when a shot is fired. The unit consists of a small rectangular pad attached to a long audio cable. All you do is plug in the audio cable, attach the pad to your gun with the provided hook and loop (Velcro) material. Then (important), you must change the LabRadar trigger settings from “Doppler” to “Trigger”. The unit works great and is easy to set up.
The text in this article is Copyright 2023 AccurateShooter.com. No site shall reproduce this article without express authorization.
Are you looking to shave POUNDS from your hunting rig or varmint rifle? There are now multiple options for folks looking for a weight-saving, carbon fiber-wrapped barrel. You’ve probably heard about Proof Research. Yes that’s a good company that crafts good products. But now Proof Research has some noteworthy competition — Helix 6 Precision in Washington State.
Helix 6 Precision crafts button-rifled and cut-rifled carbon-wrapped barrels in both conventional and “pre-fit” configurations. Pre-fits are offered for Savage rifles, Ruger Precision Rifle (RPR) series, and SIG Cross rifles. These pre-fit barrels are not cheap. A 6mm Creedmoor RPR pre-fit costs $1449.00, while the Savage pre-fits are also $1449.00 for most chamberings. The carbon-wrapped Helix 6 barrel blanks cost $1249.00 for the listed chamberings.
While Helix 6 barrels do offer significant weight savings, the founders of Helix 6 say low mass wasn’t the number one design goal: “Accuracy was paramount and weight reduction was secondary. We’ve taken the industry’s most advanced carbon fiber engineering and pushed the technology further with our proprietary … carbon fiber process.”
The founders of Helix 6 Precision say they build some of the best carbon/steel hybrid barrels on the market: “Our unique carbon fiber-layup design dampens barrel harmonics for better accuracy. Each barrel is cut from a 416R stainless steel core, and carbon fiber-wrapped using the Helix 6 Precision’s advanced process. This creates match-grade accuracy barrels with high heat dispersion that are 30% lighter than a steel barrel of the same contour. The bores are … hand-lapped for precision accuracy.” Helix 6 claims its barrels are “lighter, stronger, and faster cooling than anything else available on the market.”
Myth vs. Reality — What Carbon Can and Cannot Do
Carbon fiber is formed using thin strands of carbon bonded together with a plastic polymer resin. The resulting material is very strong and light weight. There’s a reason Formula 1 cars are crafted with carbon-fiber composites. But is a carbon-wrapped barrel the right option for you? Here are some factors to consider:
Weight Savings — There’s no doubt that a carbon-wrapped barrel will weigh less than an unfluted stainless steel barrel with identical length and contour (outside diameters). Helix 6 claims a 30% weight reduction compared to a conventional stainless steel barrel. That’s significant.
Accuracy — Carbon-wrapped barrels are NOT commonly being used for F-Class or Benchrest competition. However, Proof Research carbon-wrapped barrels have performed well in PRS competitions in the hands of top shooters. So, we can conclude that carbon accuracy is good enough for the PRS/NRL tactical game, at least at the local club level.
Heat Dispersion — Carbon-wrapped barrel-makers claim their hybrid design disperses heat better than an all-steel barrel. Some independent testers disagree, saying: “hold on now — the carbon actually acts as an insulator, so more heat is retained in the barrel”. The jury is still out. One thing that is true is that the carbon barrels seem to generate less mirage from barrel heat. Ask yourself, “if less heat is coming OFF the barrel, where is that heat retained?” But the reduced mirage could be a function of the black woven surface which may release heat differently than polished steel.
Pre-Fit, AR, and Custom Barrel Options
Helix 6 precision barrels are available as pre-fits for both Savage and the Ruger Precision Rifle in many popular long-range cartridges. Helix 6 can also thread and chamber a barrel for any precision rifle. And pre-fit AR barrels are available in a wide variety of chamberings and lengths. Helix 6 Precision also supplies carbon-wrapped barrel blanks which can be chambered and fitted by a professional gunsmith. Helix 6 barrel blanks, buttoned-rifled or cut-rifled, are sold in many calibers. Buttoned-rifled barrel calibers are: .224, .243 (6mm), .264 (6.5mm), .284 (7mm), .308 and .338. Cut-rifled barrel calibers are: .224, .243 (6mm), .257, .264 (6.5mm), .284 (7mm), .308, .338, and .375.
This article is Copyright 2023 AccurateShooter.com. No other website is allowed to publish this article in whole or in part without payment of fees.
Here are some really smart tips for hand-loaders compiled by Sierra Bullets. These suggestions were submitted by Sierra’s Facebook fans — and some are very valuable indeed. Some of these tips will help you load more accurate ammo. Other selections will help you stay SAFE — which should always be your #1 priority. For example, we concur with the advice to “Check and Double Check. Everything. Every Time”. Also definitely keep “One powder on the bench at a time” — that could be a life-saver. You may want to print these “words of wisdom” and place them on a wall in your loading room.
Reloading Safety Tips — Sound Advice
ALWAYS START LOW: “Just because a load manual says X grains of X powder with X bullet is max, your rifle could reach max pressure a grain or two before what the book says. Start low and work up.” — Walter Coats
BE SAFE and CAREFUL: “Check and double check. Everything. Every time. Only one type of powder on the bench at a time.” — Glen Lundgren
DON’T RUSH: “Be patient, don’t be in a hurry, have fun and find your rhythm. Just tell your family you’re putting yourself in ‘time-out’. They will understand.” — Erik Dyal
POWDER RULE #1: “One powder on the bench at one time, it might save your life.” — James A. Kimery
STAY FOCUSED: “Relaxed but concentrated attention. Have fun enjoying a great hobby and pastime but stay focused.” — Jim Caldwell
POLICE LOADING AREA: “Keep your reloading bench area clean and put items away ASAP.” — Eric J. Ford
BE PATIENT: “Focus, Focus, Focus — be patient — it AIN’T a race.” — William Stanley
RECORD YOUR LOADS: “Write down on a small card what you’re loading – bullet weight, powder weight, type of powder, and primer. And put it in the powder hopper. I am unloading .45 FMJ because I forgot what type powder was in the hopper.” — Michael Conniff
HAVE a PROCEDURE for INTERRUPTIONS: “If, for any reason, you have to leave the bench while in the process of dropping powder charges, turn the next case to be charged upside down in the loading block so you know where you left off.” — Bill Tinsley
LABEL EVERYTHING: “OCD is a good habit to have with your loading bench. CLEARLY label everything!” — Andy Pynckel
HAVE a GOAL: “Never start reloading or developing a load without a specific goal in mind. Second keep meticulous records.” — Peter Eick
RESEARCH THE JOB: “Read all you can about it before you start!” — Keith Shively
KEEP TRACK of the Brass: “I put all my primed brass upside down (primer up) and as I charge the casing, I (of course) flip it primer down.” — Mark Ewing
Football fans get their chance to score big with Brownells Super Barrel V Giveaway, with a jumbo red Winchester barrel chock-full of 14,000 rounds of 5.56×45 (.223 Rem) ammo up for grabs. Brownells is once again offering fans the chance to win a barrel full of freedom with its Super Barrel V contest. In connection with the Super Bowl on Sunday, February 12, 2023, Brownells will give away one huge red barrel full of 14,000 rounds of Winchester 55-grain FMJ 5.56x45mm M193 NATO ammunition. Now through 11:59 pm CST on 2/15/2023, you can sign up online for a chance to win the big barrel of ammo.
One lucky Brownells fan will bring home the big barrel full of 14,000 rounds of ammo. Now through February 15th at midnight, contestants can enter their email addresses at the Brownells Super Barrel page for a shot at the 14,000-round barrel, valued at over $7,000.00.
If you want a chance to win, sign up at the Brownells Super Barrel V webpage. One lucky winner, name drawn at random, will win the big red barrel full of Winchester ammo. The barrel contains enough ammo for the winner to take 100 people to the range to fire 100 rounds each — and still have 4,000 rounds of ammo left over. By itself, the ammo weighs as much as 484 12-ounce cans of America’s favorite macro brew, or the equivalent of more than 500 bags of tortilla chips.
Entries will be accepted until 11:59 pm CST on February 15, 2023. Then one lucky winner will be chosen to receive the enormous barrel full of American freedom seeds. For more information, and a chance to win, visit the Brownells Super Barrel page.
Those 14,000 Rounds Could Stretch 870 Yards
Containing enough ammo to fill 70 standard-length belts for an M249, the Winchester barrel weighs more than even an NFL football lineman. If all 14,000 cartridges contained inside were laid to end-to-end, they would stretch over 870 yards — almost twice as far as the most passing yards ever in a modern pro football championship game.
The Sweepstakes is open to legal residents of the United States, excluding the following states and territories: Alaska, California, Connecticut, Hawaii, Maryland, Massachusetts, New Jersey, New York, the District of Columbia, all U.S. territories and possessions, and all overseas military installations.
AR-platform rifles run dirty — very dirty. The gas system blows carbon and powder residues back into the action and into the bolt carrier group. That’s why you need to clean your ARs regularly, and you have to pay special attention to the nooks and crannies in the bolt and bolt carrer. The majority of AR failures we’ve witnessed have been from a combination of lube, carbon, and tiny brass shavings that collected in the ejector recess and the extractor spring recess. After that, plain carbon build-up on the bolt can be a gun-stopper too. And you need to keep the barrel extension clean too.
If you’re new to the (dirty) world of ARs, here are two helpful videos from the folks who make Froglube. That line of cleaners/lubes is pretty good stuff, though not our first choice for all AR lubrication and cleaning chores. But these videos do provide many helpful tips. They show the disassembly process and highlight the problem areas to which you must pay special attention.
How to Clean Your AR-15 Bolt Carrier Assembly
How to Clean Your AR-15 Lower Receiver Assembly
NOTE: Froglube also makes a video showing AR upper, chamber, and barrel cleaning. There are practices shown there that we do NOT recommend. Nor do we recommend Froglube products for bore cleaning. We think there are more effective cleaning products.
The Firearms Regulatory Accountability Coalition (FRAC), SB Tactical, B&T USA, Rick Cicero, and 25 States have filed a lawsuit against the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) challenging the legality of a new ATF rule that reverses a decade of ATF agency precedent. That radical ATF rule would retroactively mandate the burdensome and costly registration of millions of pistols equipped with stabilizing braces, contrary to federal statutes enacted by Congress.
“The ATF has placed millions of law-abiding firearm owners in legal jeopardy”, notes Jeff Creamer, president and CEO of SB Tactical. “It’s a gross overreach of the Bureau’s authority and, if allowed to stand, will result in the largest gun registration scheme in U.S. history.”
The new ATF rule lacks a clear definition of what is actually being regulated. The language gives ATF the power to decide on a case-by-case basis which firearms are and are not regulated. READ NRA-ILA Analysis.
“The ATF’s new definition for stabilizing braces is arbitrary. The Bureau is declaring that they will effectively decide on a case-by-case basis whether a firearm is subject to the NFA. Every American gun owner is in danger of potentially facing felony charges at the whim of these bureaucrats and without any new statute in place. The NRA believes this rule will fail for the same reasons the bump stock rule failed — ATF can only apply federal statutes; it can’t rewrite them”, said Jason Ouimet, executive director of the NRA Institute for Legislative Action.
“This rule demonstrates a clear abuse of power by the ATF”, Ouimet said. “They’re clearly carrying out the Biden Administration’s anti-gun agenda and it’s got to stop. The NRA is putting its full weight behind fighting this unlawful rule”.
About Stabilizing Braces
Stabilizing braces were designed to enable gun owners to operate certain firearms with one hand with more stability. The ATF’s new rule says, essentially, that using a stabilizing brace with a pistol turns the firearm into a short-barreled rifle and must now be regulated by the National Firearms Act (NFA) — which means they’d be subject to registration, additional taxation, and long wait times for approval due to ATF’s lengthy NFA processing times. Because of this rule, the millions of Americans who own a pistol and a stabilizing brace, regardless of style or caliber or type of brace, must either dispose of, alter, or register their firearms. If they don’t comply, they will become felons and face 10 years in prison and large fines.
According to the Congressional Research Service, there are currently between 10 and 40 million stabilizing braces in the United States.
FRAC is Lead Plaintiff with Coalition of 25 States
The lawsuit challenging the ATF policy is Firearms Regulatory Accountability Coalition, Inc (FRAC)., v. Merrick Garland and was filed in the U.S. District Court for the District of North Dakota.
Along with FRAC, other plaintiffs are: SB Tactical, B&T USA, Wounded Warrior Richard Cicero, and a coalition of 25 states led by West Virginia Attorney General Patrick Morrisey and North Dakota Attorney General Drew Wrigley, also including Alabama, Alaska, Arkansas, Florida, Georgia, Idaho, Indiana, Iowa, Kansas, Kentucky, Louisiana, Mississippi, Missouri, Montana, Nebraska, New Hampshire, Oklahoma, South Carolina, South Dakota, Tennessee, Utah, Virginia, and Wyoming.
Forum member Jacob spotted this simple, but effective set of scope ring inserts on the Brownells Website. With these inserts, you can use a scope with 1″-diameter main tube in 30mm rings. Non-marring, matte black Delrin sleeves surround the scope tube so it can fit larger-diameter rings. Each sleeve comes in two parts for easy installation around your scope tube. This way you can use the same 30mm rings for all your scopes.
