The Ruger Precision Rifle (RPR) has been a huge sales success. Nearly a year after its introduction, the RPR remains in very high demand. The first production run by Ruger essentially sold out, so it is very hard to find one for sale, in any caliber.
Though it has a big winner on its hands, Ruger has made some upgrades to its popular RPR. An “enhanced” RPR will be offered with a new handguard, bolt shroud, and muzzle brake. Two new models have been added to the RPR line-up, the model 18004 in .308 Win, and the model 18008 in 6.5 Creedmoor. These models, priced at $1599.00 MSRP, feature a new, low-profile handguard, a new aluminum bolt shroud, and a muzzle brake. The new handguard will work better for scopes with large front objectives. The muzzle brake should reduce felt recoil, but we do wonder whether accuracy might suffer. The brakeless, first-generation RPRs exhibited very good accuracy most of the time.
For the time being, the original model RPRs will be offered along with the new enhanced RPRs: “Both the original and enhanced configurations will be available from Ruger for a time, with the initial pattern being phased out as supplies are depleted.” (Source: American Rifleman). But there is a catch. The new models cost $200.00 more than Gen 1 RPRs. Ruger lists a $1599.00 MSRP for the enhanced RPRs versus $1399.00 for Gen 1 models.
To See NEW FEATURES, click the image below, then SCROLL down the page on the Ruger web page that loads. Yes, the VIDEO is there — you just have to scroll down.
According to American Rifleman, the new handguard has multiple benefits: “Still free-floating and KeyMod-compatible, the new design omits the original’s top-mounted Picatinny rail in order to increase scope clearance. Given the larger objective lenses utilized by long-range optics, this enhancement makes a lot of sense. The bottom surface of the new handguard is also contoured with a flatter surface, providing for a more stable foundation for the mounting of bipods than the original model.” Current RPR owners can purchase the new-style 15″ aluminum handguard for $249.95 from ShopRuger.com.
Ruger RPR Hybrid Muzzle Brake
The original, Gen 1 Ruger Precision Rifle had a threaded muzzle covered by a thread cap. The new “enhanced model” features a factory-installed “hybrid” brake fitted to the barrel. This brake combines radial holes in the rear half with large, angled side ports in the front. Ruger claims the brake reduces recoil almost 40% on a 6.5 Creedmoor. This brake can be purchased separately for $99.95 from ShopRuger.com.
Share the post "Ruger Upgrades Ruger Precision Rifle and Raises Price $200.00"
Tuners work. So do muzzle brakes. But until recently, you had the choice of one or the other. Now with combo tuner/brakes you can tune the harmonics of your rifle barrel while enjoying significantly reduced recoil (and torque). This is a “Win-Win” for shooters of heavy-recoiling rifles.
Rifle accuracy and precision have come a long way in the past 15 years, particularly for long-range applications. The most recent tool to significantly improve precision is the barrel tuning system. The Rifle Accuracy System (RAS) developed by Precision Rifle Systems, incorporates a precision muzzle brake with the tuner. CLICK HERE for Product INFO.
This system potentially offers meaningful group size reduction through control of barrel harmonics. The RAS tuner/brake system was the subject of a June 2012 Precision Shooting (PS) magazine article, titled “Improved Rifle Accuracy” and was also featured in an article in the November 2012 issue of PS titled “Tuning with Confidence”.
READ MORE about RAS Tuner Tests on .260 AI, .223 Rem, and 22LR rimfire rifles.
Copies of both articles and detailed instructions on RAS installation and tuning can be downloaded from www.bostromgunsmithing.com. Eric Bostrom is the distributor for the RAS.
Share the post "Tuner/Brakes — Dial in Smaller Groups and Less Recoil"
For a prone shooter, particularly on dusty, dirty or sandy ground, muzzle blast is a major bummer. Muzzle blast can be very disturbing — not just for the trigger-puller but for persons on either side of the gun as well. Some muzzle brakes send a huge shockwave back towards the shooter, and others send blast towards the ground, kicking dirt and debris into the prone shooter’s face. If there was a way to illustrate those factors — shockwave and debris — that might help shooters select one brake design over another.
Cal Zant at PrecisionRifleBlog.com applied a unique blend of creativity and resourcefulness to try to answer that question for 20+ muzzle brakes. Using high-speed photography and household products, he captured the blast pattern of 20+ different brake designs for easy side-by-side comparison. Can you figure out how Cal managed to show muzzle brake blasts so clearly? His “hi-viz” solution, revealed in the article, is very clever. See the eye-opening results for 20+ brakes, with illustrative photos, by visiting the Precision Rifle Blog Muzzle Brake Ground Signature Test Page.
Share the post "Muzzle Brake Blast Pattern Comparison Test"
Sound can be a tricky subject, but Cal Zant, the editor of PrecisionRifleBlog.com, presents everything an informed shooter should know about muzzle brake noise in a straightforward and practical way. Most sound tests are measured from the side of the muzzle, in accordance with mil-spec standards, and Cal did that. But he also measured the sound level of each brake from behind the rifle, closer to the shooter’s position. This provides a more accurate indicator of the actual sound levels firearms operators will encounter while shooting.
Muzzle brakes ARE really loud — that’s something most active shooters have observed. But this study finally gives us some hard data and makes objective comparisons. The difference between brakes was quite significant. Some brakes were ear-splitting — more than twice as loud as other brakes tested.
As a bonus, Cal also provides data on how the new Ultra series suppressors from Thunder Beast Arms Corp (TBAC) compare in terms of sound level behind the rifle.
Another massive, data-driven field test has been completed by our friend, Cal Zant, over at PrecisionRifleBlog.com. The past few months, Cal has tested 20+ muzzle brakes designed for 6mm, 6.5mm, and .30-caliber precision rifles. Hundreds of hours have gone into this research, and it provides a lot of new insight and empirical data for several aspects of muzzle devices. Cal put a huge amount of labor/engineering into these tests and his findings deserve to be widely read.
Recoil Reduction
Cal created a system to directly measure the entire recoil force signature of each muzzle brake using high-speed sensors. Although the recoil cycle happens very quickly (around 1/100th of a second), his test equipment could record up to 1,000 force data points during a single recoil cycle! He fired over 1,000 rounds of match-grade ammo through four different rifles: 6XC, 6.5 Creedmoor, .308 Win, and the monster .300 Norma Magnum. He literally spent thousands of dollars on this part of the test, to ensure he got it right.
Cartridge Types Tested: 6XC, 6.5 Creedmoor, .308 Win, and .300 Norma Magnum
Ability To Stay On Target
David Tubb helped Cal develop this part of the test, because David believes this is the most important aspect of a muzzle brake. Using a laser and high-speed camera, Cal was able to objectively quantify how well each design helped you stay on target.
Noise Level
Muzzle brakes are loud, but some are louder than others … three to four times as loud. Cal enlisted the help of an expert from the suppressor industry to precisely measure how much louder each muzzle brake made a rifle. Each brake was tested in accordance with MIL-STD-1474D using calibrated military-approved equipment, and the noise level was also tested at the shooter’s position. This produced some interesting results.
Zant also includes high-res photos of each brake, and plans to publish other info about each model (including price, whether it requires gunsmithing, what calibers it is available in, etc.) to make it easy to compare them side-by-side.
Cal recently started publishing the results of these tests, and there is already a lot of interesting info. The data might surprise a few people and even dispel a few myths. Particularly interesting is Zant’s comparison of recoil reduction with a suppressor compared to muzzle brakes. How do you think the suppressor performed compared to the brakes? You may be surprised.
Sporter Chronograph Kit includes: Bayonet Sensor, 3.5 foot Data Cable, Remote Display (with Battery), Strap with thumb nut, Two V-block spacers, and compact storage box.
Magnetospeed has just introduced a new bayonet-style chronograph that is less than half the price of previous MagnetoSpeed models. This is big news for shooters who always wanted a MagnetoSpeed but found the $399.00 cost (for V3 model) too pricey. The new Sporter Chronograph will cost just $189.00. It offers most of the features of the more expensive models (see chart below for details) and has a updated sensor. The MagnetoSpeed Sporter chronograph kit was designed to be used on barrels from 1/2 inch up to 1 inch in diameter. In can also accommodate muzzle brakes and flash hiders up to 2.7 inches in length. MagnetoSpeed says its new Sporter is “Ideal for contoured rifle barrels (sporter barrels) and long-barreled revolvers.”
See $189.00 Sporter Chronograph Features Reviewed in Video
MagnetoSpeed Sporter features
Simple, one-button cycling display (shows recent shot velocity and statistics).
Three sensitivity settings for fine-tuning.
Easy access battery compartment, with 9V Battery included.
Integral, quick-attachment system, with metal buckle, nylon strap, screw-in tensioner, and dual V-block spacers (thick and thin).
Bayonet works with Muzzle Brakes and Flash-hiders up to 2.7″ long.
Q: Will the Sporter Chrono work with thicker barrel (i.e. greater than 1″ diameter)?
A: The manufacturer recommends the $399.00 V3 model for thicker barrels. But, wink-wink, if you have a 1.25″ barrel you can get this to work, based on what we’ve seen. If you need to go really fat (up to 2.0″ diameter), get the V3. Magnetospeed also says the V3 is needed for airguns, shotguns, and muzzleloaders.
Click Image for Full-Screen Photo
Share the post "MagnetoSpeed’s New $189.00 Sporter Chronograph"
Our friend Robert Whitley of ARX Enterprises LLC has learned, through careful measurement and testing, that some barrels threaded 5/8″ x 24 tpi at the muzzle may not deliver optimal accuracy. The reason is that the end of the barrel can bell out slightly, like a trombone, because too much steel has been removed. This is particularly true with .30-caliber barrels, but it can also be a problem with smaller caliber barrels (even 6mm). Robert demonstrates this phenomenon in the video below. All gunsmiths, and anyone considering threading a barrel, should watch the video. At 1:00 – 1:30 Robert gauges a 5/8″ x 24-threaded .30-Caliber barrel. You can see the belling effect clear as day.
“When setting up a commercial barrel in the lathe, we noticed that the maximum-sized bushing that would fit in the bore at the chamber end was almost .0015” smaller [than what would fit] at the muzzle. That precipitated my pin-gauging of a number of different commercial barrels that were threaded for 5/8” x 24 tpi. What I found is what’s shown on the video.” – R. Whitley
Solve Problem with a Larger Thread Diameter
If 5/8″ x 24 threading is potentially harmful to accuracy, is there a solution? Yes, you simply need to leave a little more steel on the barrel. (See Video starting at 02:40.) Frank Green of Bartlein barrels states: “We get these questions all the time. I say run the largest thread diameter that is possible.” Robert Whitley has found that a 3/4″ x 28 tpi threading does not cause the “belling effect”. Accordingly Robert recommends 3/4″ x 28 if you need to thread your barrel for a muzzle brake or suppressor. Robert explains: “We only make 3/4” x 28 tpi muzzle brakes and that’s what we recommend to customers.”
“See how much meatier the 3/4″ threading is vs. the 5/8″. The 3/4″ threading offers a lot more metal around the bore. There’s a lot less opportunity for the bore to become bell-mouthed…” – Robert Whitley
Barrel Threading Diameter — What’s Important to Know By Robert Whitley
In truth, the 5/8” x 24 tpi threading never came out of any accuracy-based think tank or set-up, it’s a military .30-Cal threading for barrels that someone has to carry around (they needed to keep the barrel weight down so it was smaller in diameter and the threading had to work with that situation). People have somehow assumed because the military uses that threading for certain things that it must mean that it’s also fine for a highly accurate rifle too, but that’s not really correct.
I don’t think there is any better and realistic option than the 3/4” muzzle threading, and we also do it so there is no relief cut behind the threads on the barrel (i.e. put the relief cut on the brake or jam nut, don’t chop down on the muzzle of the barrel). For some reason many have a hard time grasping that the metal at the muzzle end of a rifle is “sacred” and you should not cut it down any more than absolutely necessary. A little threaded pencil diameter nub on the end of a barrel is not ideal for accuracy especially if it’s threaded and you need to torque on it. I cringe when I see a barrel with something like an MTU or Heavy Varmint contour, only to have an itty-bitty pencil thin threaded nub right at the muzzle so someone can “screw on a can” or a muzzle brake.
Lessons Learned Over the Years
A number of years ago I did a 30BR rifle project with Craig Kostyshyn who was big in the 30BR game and he made some of the best 30BR rifle barrels for benchrest competition. When I did the project I wanted a medium-heavy Palma type contour barrel I could use and also have a muzzle turndown for a front sight band. When he found out I was going to have the muzzle turned down he said “whoa, I need to provide for that when I make the barrel because if you turn the front down later you’ll be shooting a trombone” (i.e. the muzzle bore dimension would open up).
What he did was rough contour the barrel with the turndown (about .010” oversize) before he lapped the barrel, then when he lapped the barrel he took it easy in the muzzle area and worked the back of the barrel more. I thought he was a little bit excessive in his concerns but the barrel shot great and I wasn’t going to argue with him, after all he was shooting groups in the ones. I kind of just filed that away and never thought about it until recently when I went to have Fred from Sabreco do some chamber re-work on a commercial .30-caliber barrel I had. When setting up the barrel in the lathe and indicating things Fred noticed that the maximum-sized bushing that would fit in the bore at the chamber end was almost .0015” smaller [than what would fit] at the muzzle and he mentioned it to me. That precipitated my pin- gauging of a number of different commercial barrels I had that were threaded for 5/8” x 24 tpi. What I found is what’s shown on the video.
NOTE: This is a copyrighted article. Do not reproduce or re-link more than 75 words without written permission from AccurateShooter.com.
Share the post "Muzzle Threading — Don’t Remove Too Much Steel"
If you want to see how a muzzle brake really works, definitely watch this remarkable slow-motion video compiled by Proof Research.
This amazing video features a variety of firearms: suppressed 9mm pistol, .338 Norma rifle, .300 WinMag rifle, 12ga comp’d shotgun, plus an AR15 and AR10.
This Must-Watch Video Has Some Amazing Ultra-Slow-Motion Segments
Watch the ultra-slow motion segment at the 2:55 mark and you can actually see a .30-cal bullet spin its way through the muzzle brake, leaving trail of flame that blows out the ports. Interestingly, at the 3:10 mark, you can also see a bright “afterburn” ball of fire that forms a few inches ahead of the muzzle milliseconds after the bullet has left the barrel. Perhaps this is late ignition of unburned powder?
Proof Research (PR) sells high-grade hunting and tactical rifles built with PR-made actions and carbon-wrapped barrels. For more information, visit ProofResearch.com.
Credit Steve of TheFirearmBlog.com for this YouTube video. Footage by JNZ for Proof Research.
Share the post "Slow-Motion Video Shows Bullets Pass Through Muzzle Brakes"
Product Preview by Jim Bennington
Rifle accuracy and precision have come a long way in the past 15 years. The most recent tool to significantly improve precision is the barrel tuning system. The Rifle Accuracy System (RAS) developed by Precision Rifle Systems, LLC of Myakka City, Florida, brings a fresh approach to tuning. The RAS incorporates a precision muzzle brake with the tuner.
This system provides significant precision improvements and was the subject of a June 2012 Precision Shooting (PS) magazine article, titled “Improved Rifle Accuracy” and will also be featured in an article in the November 2012 issue of PS titled “Tuning with Confidence”.
READ MORE about RAS Tuner Tests on .260 AI, .223 Rem, and 22LR rimfire rifles.
Copies of both articles and detailed instructions on RAS installation and tuning can be downloaded from www.bostromgunsmithing.com. Eric Bostrom is the distributor for the RAS.
Accuracy is the ability of a firearm to hit what it is aimed at within the limits of the precision of that firearm. Precision is the ability of a firearm to place successive shots in or near the first shot. A firearm that delivers one minute of angle (1 MOA) precision should, at 100 yards, place the bullet within roughly one inch of where it is aimed (actually 1.047″), or a sight adjustment should correct the problem. All the improvements in optics, manufacturing and components have allowed precision expectations to go from 1 MOA to 1/2 MOA or even sub-quarter-MOA.
What is the next frontier for the precision rifle? While all the other advancements were being made, advancements in the understanding and methods of managing the barrel vibrations were also being made. Once the rifle has been built and the loads developed, it is the management of the barrel vibrations that has the final influence on the bullet as it is leaving the barrel and the final influence on precision. The RAS has demonstrated with many different rifles and calibers that significant improvements can be made with a properly tuned barrel tuner system. What does this mean? Typically, there is a noteworthy improvement. In fact group size improvements between 30% and 60% have been observed with a properly-tuned barrel tuner system. This has been demonstrated on both custom rifles and loads and factory rifles.
Share the post "Combo RAS Tuner & Muzzle Brake from Bostrom Gunsmithing"
Muzzle brakes are controversial. Some people swear by them, while others swear at them. Still, there’s no question that a good brake can reduce felt recoil up to 45%. And likewise, the best brakes, when installed properly, seem to have no negative effect on accuracy.
Roy Bertalotto has done considerable experimentation with muzzle brakes, testing dozens of brake designs on his own rifles over the past few years. Roy’s article, Adventures with Muzzle Brakes, discusses various aspects of muzzle brake design and performance. Roy doesn’t claim that his testing is definitive, but his article is definitely worth a read. Here are some of Roy’s interesting findings:
Exit Hole Diameter
“Best accuracy and effectiveness of the brake was obtained with a hole .020″ over bullet diameter. If the exit hole is too small, such as +.005″ over bullet diameter, accuracy suffers. If the depth of the exit hole is too shallow, the metal around the hole will erode very quickly.”
Hole Placement
“The most effective braking was with a brake 1″ in diameter with a 3/4″ exit hole on each side, just in front of the muzzle. The bullet passes through a cone of 35 degrees before it exits the brake. (Like the tank example), Incredible reduction of recoil. But loud and ugly. Very easy to make since you don’t need a spin fixture or a dividing head.”
Bottom Gas Venting Helps Accuracy
“In my tests, not having holes all around the brake effects accuracy a bit. I believe it does something to the bullet by the air pushed ahead of the bullet creating unequal turbulence in the bullet path. I’ve tried a few brakes where I drilled only holes on the top, test fired, and then completed holes on the bottom and in every case, accuracy improved.” Below are spiral-ported brakes crafted by Clay Spencer.
Brakes Work Best with High-Pressure Cartridges
“The higher the pressure of the particular round, the more effective the brake. I have over 20 rifles with brakes. The 220 Swift is the king of reduction. Followed very closely by the 25-06, 6mm Remington, any Weatherby small bore. With a proper brake and a hot handload under a 40 gr bullet, the Swift will move 1/2″ to the rear and 0 muzzle rise! Big boomers with low pressure like 45-70s and shot guns benefit the least.” [Editor’s Note: Roy is judging effectiveness by the percentage of recoil reduction rather than absolute levels of recoil. Obviously if you start with a heavier-recoiling round, the absolute amount of recoil energy reduction is greater. Roy is really talking about efficiency–brakes are most efficient when used with high-pressure cartridges.]
Installation is Key to Accuracy
Roy’s findings are fascinating and suggest that further study of muzzle brakes is warranted. But we can all agree that precision installation of the brake is essential for accuracy. A poorly-installed, mis-aligned brake will degrade accuracy, that is well-known.
Harrell’s Precision has made thousands of muzzle brakes, in many styles and port arrangements. The Harrell brothers offer some good advice for gunsmiths installing brakes: “Muzzle brakes aren’t magic, they reduce recoil by redirecting exiting gas. What’s important is that they are straight and the threads are perpendicular with the base. The only way to get the base and threads perpendicular is to thread, not tap, them on a lathe.”
Share the post "Muzzle Brake Performance Tests by Bertalotto"
Forum member Kenneth Skorpen (aka “Sal”) from Norway sells a variety of shooting products through the www.Vertebrae.no website. Among the more interesting products offered by Skorpen are a series of muzzle brakes that can be installed on your barrel with no gunsmithing required — if the barrel tip has already been threaded. Crafted in Norway by Vektor Maskin, these muzzle brakes employ an internal inside/outside threaded bushing with a stop nut that fits on the barrel. With the threaded bushing in place, you simply screw the muzzle brake onto the bushing, align it so the ports are horizontal, then set the stop nut and set-screws. (Note, the set-screws touch only the bushing — they do not impinge on the barrel itself.) The video below shows how Vektor spin-on muzzle brakes are installed:
There are compact, standard, and large size Vektor muzzle brakes. Adjustment and installation is the same for all three sizes. The small, compact model, with two rows of opposed horizontal ports, is designed for .223-caliber rifles. The medium (standard) size, with either double or triple sets of opposed ports, is suited for 6.5mm or .308 calibers. The largest size, with three rows of large ports, is configured for the .338 magnum calibers. Skorpen claims that all three sizes of Vektor brakes can reduce felt recoil by 70% to 80% The brake itself is SIS1914-04 steel with an oiled zinc phosphate finish. The internal socket is AISI 303 (SUS 303) stainless steel.
If your barrel is already threaded at the muzzle, the Vektor brakes can be installed with no metal-work or gunsmithing required. Otherwise, you will need a gunsmith to thread the muzzle end of the barrel. The Vector bushings can be machined to a variety of thread types: 1/2″-20/UNF, 1/2″-28, 5/8″-18/UNF, 5/8″-24, m14x1, m14x1.5, m15x1, m16x1, m17x1, and m18x1. Just indicate the thread pitch you require when ordering.
How to Order Vektor Muzzle Brakes
Skorpen’s company, Vertebrae Sikkerhet & Teknikk, exports these Vektor brakes at reasonable prices. With one (1) supplied bushing, the compact brake is $131.43 USD, standard brake is $167.64 USD, and the large (magnum) brake costs $198.49 USD. Extra bushings are available for around $20.00. While the website lists .223, 6.5mm, .308, and .338 caliber brakes, Vetebrae can produce brakes in other calibers on request (add 5 days to delivery time).
You can also purchase Vektor muzzle brakes by emailing joachim [at] vertebrae.no. (It may be cheaper to order direct via email.) Just send an email stating your desired caliber and thread pitch. Normal delivery time to the USA is one to two weeks.
Share the post "Vektor Muzzle Brakes From Norway Install Without Gunsmithing"
The Ruger® Guide Gun has been awarded a 2013 “Best of the Best” Award from Field & Stream magazine. The current Ruger Guide Gun combines features of several of Ruger’s most popular rifles in a versatile, general-purpose hunting rifle.
The Guide Gun features a stainless action and barrel, removable muzzle brake, safari-style iron sights, adjustable length-of-pull (with three 1/2″ spacers), barrel band sling swivel, and a Green Mountain laminated wood stock. The new Ruger Guide Gun is available in .30-06 Spr, .300 Win Mag, .338 Win Mag, .300 RCM, .338 RCM, and .375 Ruger. A left-handed configuration is available in .375 Ruger.
Removable Muzzle Brake/Weight
The Ruger Guide Gun includes a removable, radial-port muzzle brake that significantly reduces felt recoil. If you don’t need the brake, it may be replaced by a dynamically-matched muzzle weight, provided as part of the system. Ruger claims that: “switching between the brake and the weight will not change the bullet’s point of impact. The included thread protector may be used if neither the brake nor the weight is desired.”
Video Explains Ruger Guide Gun Features
The Ruger Guide Gun has Mauser-type controlled feeding (with claw extractor), three-position safety, and Ruger scope rings that install on the integral mounts. All Ruger Guide Guns feature windage adjustable shallow “V” notch rear sights and large white bead front sights for instant sight alignment.
Guide Gun May Be Rugged and Versatile, but Accuracy is Disappointing
The Guide Gun tested by Field & Stream had a heavy trigger and mediocre accuracy, but the Magazine’s editors still praised its hunting capabilities: “On our .375 Ruger test rifle, the trigger broke at 4 pounds, 8 ounces with a very slight creep. The mechanism is an open design that will not collect water or debris. Our groups averaged 1.40 inch at 100 yards, fine for a rifle of this type. The removable muzzle brake does a good job of suppressing recoil, but if you don’t care for the noise it can be removed and replaced with an unported dummy brake of identical weight that allows you to keep your zero.”
Editor’s Comment: Field & Stream may be satisfied with a one-and-a-half MOA rifle for hunting purposes, but frankly, we expect better accuracy from a gun with an $1199.00 MSRP. Is this really “Best of the Best”? At that price, we don’t think so. The Guide Gun does have some interesting features, but you’ll pay a premium for that trick muzzle brake and the safari sights.
Share the post "Ruger Guide Gun Named Field & Stream ‘Best of the Best’"
Ruger RPR Hybrid Muzzle Brake
Tuners work. So do muzzle brakes. But until recently, you had the choice of one or the other. Now with combo tuner/brakes you can tune the harmonics of your rifle barrel while enjoying significantly reduced recoil (and torque). This is a “Win-Win” for shooters of heavy-recoiling rifles.
If you want to see how a muzzle brake really works, definitely watch this remarkable slow-motion video compiled by 
There are compact, standard, and large size Vektor muzzle brakes. Adjustment and installation is the same for all three sizes. The small, compact model, with two rows of opposed horizontal ports, is designed for .223-caliber rifles. The medium (standard) size, with either double or triple sets of opposed ports, is suited for 6.5mm or .308 calibers. The largest size, with three rows of large ports, is configured for the .338 magnum calibers. Skorpen claims that all three sizes of Vektor brakes can reduce felt recoil by 70% to 80% The brake itself is SIS1914-04 steel with an oiled zinc phosphate finish. The internal socket is 
Removable Muzzle Brake/Weight
