100% Designed & Made in America

Free Shipping via USPS Flat Rate Box anywhere in the USA

Bison Armory is proud to introduce its latest innovation: the FOREARM SKIN (Patent Pending) – a flexible but rugged cover that quickly zips securely around the forearm (and any rails) of an AR-15 platform rifle. The Skin’s ballistic nylon and neoprene construction protects the forearm and rails from damage and provides the shooter with unparalleled comfort and utility in all conditions.

Flat Dark Earth Forearm Skin on Rifle Length Troy Alpha Forearm (Custom Patriot Brown hardware)

WHY A FOREARM SKIN? Anyone who has carried an AR-15 in the field knows the ‘joys’ of handling an aluminium forearm for hours on end. The metal gets cold in the morning, so you wear gloves, which inevitably make your hands sweat. Once in the sun, the forearm absorbs heat and slowly roasts your hands until you put your sweaty gloves back on. And if your forearm has picatinny rails, then it’s either gloves all day or hamburger hands. But gloves don’t protect your forearm and rails from damaging impacts and snags on your surroundings. And exposed metal has a way of going ‘clink’ at just the wrong time. The rail covers currently on the market attach to picatinny rails, so if you aren’t running rails, you’re out of luck. And you can forget about comfort in any case, since the covers are all made of hard polymers. They increase the number of edges and perforations that can snag, while leaving portions of the forearm unprotected and doing nothing to promote sound dampening.

BLack Forearm Skin on Black Rifle Length Quad Rail

After years of hunting with AR-15s, we thought: “There has to be a better way!” Now there is. Forearm Skins provide a cushioned and insulated layer between you and your forearm, for an always comfortable grip and a streamlined, snag-free profile.

Specifications: All of our skins are 3-4mm thick, but compressible due to their neoprene core, so consider your clearances if you have a scope mounted. All of our Skins are also currently 9” in length. They cover the full length of a mid-length forearm, and partially cover intermediate, rifle and extended length forearms. On forearms longer than 9”, the skin can be positioned to suit the needs of the user in re hand placement and clearance for sling mounts, bipods, etc.

For Quad Rail Forearm compatibilty click HERE for a link to our product page.

For Smooth Tube / Alpha Rail Forearm compatibilty click HERE for a link to our product page.

Black Forearm Skins on Quad Rails – Mid Length (Top) and Rifle Length (Bottom 3)

Construction: Forearm Skins are designed and made in the USA. The rugged ballistic nylon surfaces of our Skins enclose a neoprene core. The Skin is fastened with a color-matched YKK molded tooth zipper and a Velcro tab so the zipper-pull doesn’t rattle or snag.

FDE Forearm Skins on Midlength Tube (top), Rifle Length Tubes (middle 3) and Rifle Length Troy Alpha (bottom)

Installation: If you can work a zipper you can install and remove a Forearm Skin. No tools are required for installation or removal, and the Skins work on forearms with or without rails. The Skin fits snugly around the forearm, and will not shift once installed.

Care: Forearm Skins are washable and will not shrink or deform. Mud, blood, whatever – just hand wash with water (and maybe a bit of household laundry detergent) and drip dry.

Here’s a sneak peek at our PROTOTYPE multicam version (coming soon). The finished one will have FDE trim not black

Bison Armory Shim Set Instructional Video

We’ve created a new instructional video that you can use to help with the installation of Bison Armory barrel nut shim sets. You can purchase shim sets at our web store HERE, which will help you get perfect alignment and torque when installing your AR-15 barrel. Our shim set works with any AR-15 barrel nut that requires correct alignment. The instructional video is featured on YouTube and we’ve embedded it below:


New SHIRTS are here!

Our new line of shirts is here just in time for summer – available in sizes Large, Extra Large, and Extra-Extra Large! These are olive green “Hanes Beefy Tee” cotton shirts, with the Bison Armory logo in white on the front, and a 4 color graphic on the back – with the bullets done in proper bullet colors! Here’s a link to the product page:

medium new shirt

Perfect for Cougar watch in the driveway… seriously, we had a cougar in the driveway a few months ago!

IMG_3489 (547x640)

Back graphic detail

IMG_3496 (640x157)

Front graphic detail

NEW: Bison Armory 16″ .223 Wylde Barrels

Bison Armory is now selling our great shooting .223 Wylde barrels on our web store here. These barrels are made from 416 stainless steel, button rifled with 1:7 twist 6-groove rifling, and have .223 Wylde chambers, which means they handle .223 Remington and 5.56 NATO ammo equally well.

Our current offering is a 16″ Recon profile barrel that is capable of MOA performance. Starting at $160, these barrels can’t be beat on price for performance. These barrels are in stock now and ready to ship.

Notes on Bison 6.8 SPC Subsonic


Just a couple of quick notes on the Bison Armory 6.8 SPC subsonic platform (AKA 6.8 BSP).

1. A 16″ Bison 1:7 twist barrel with carbine length gas will cycle 180 and 200 grain subsonic ammunition WITHOUT a silencer. This includes bolt lockback on the last round in the magazine.

2. All Bison 1:7 twist barrels will handle all commercially available 6.8 SPC ammunition, including SSA Tactical loads.

3. Field testing has shown no difference in accuracy between the 1:11 twist 16″ recon and 1:7 twist 16″ recon. Reports from customers have indicated that the 140 Sierra Game King performs extremely well when loaded supersonic in the 1:7 twist barrel, especially for ranges beyond 200 yards.

4. Shooting subsonic with or without a silencer is fun. Without a silencer we still recommend hearing protection, but simple ear plugs will do, recoil is minimal, blast is diminished substantially, all of which makes it a great back yard plinker, especially for the kids. The only draw back is the ammunition cost of the subsonic rounds.

Conclusion: Go Bison 6.8 SPC subsonic!

6.8 BSP Carbine

Here’s another Bison Armory 16″ BSP carbine. It’s a demo that we loaned to some fine folks at the 68 forums for a member shoot. The carbine is sporting a new 11″ Troy Alpha rail with flip front sight. Pretty slick.

Sunny Day at the Range with the 7.62 / .308 Win.

Our delightfully crappy West Coast spring weather cleared up long enough for us to make it to the range and really put in some quality time testing our new 7.62 NATO / .308 Winchester barrels. The results were outstanding, and we easily achieved sub-MOA results at both 105 and 219 yards. Why these weird distances? No idea. But whoever set up the range obviously wanted to make it just a wee bit more difficult than usual.

At 105 yards, Ben put together the winning group using Federal Gold Medal Match .308 ammunition tipped with 175 grain SMK bullets and measured 0.84″ (measuring the greatest distance between the centers of any two shots in the group).

The 105 yard group


Ben working on a nice 105 yard group

At 219 yards, James nailed down the best group using Silver State Armory 7.62×51 ammunition tipped with 168 grain Sierra OTM bullets and measured 1.84″

The 219 yard group


James dialing it in at 219 yards (Not even our camera knew what to do about all the sun in the background)


6.8 SPC and Twist Rate

I cross posted this at 68 Forums and I’m adding it here for posterity.

Here’s the rub: Twist rate makes ZERO difference to barrel performance.  My earlier theoretical analysis appears to be supported and I expect that twist rates equal to or slower than 1:4 will see no appreciable difference in pressure or muzzle velocity. So far I haven’t seen any difference with 16″ 4-groove barrels in 1:7 vs 1:11 twist.

The numbers (mv in average of several shots):

16″ 6.8 BSP”

SSA 115 OTM: 2492 fps

SSA 110 TSX: 2547 fps

SSA 85 TSX TL: 3010 fps

16″ 6.8 SPC II 1:11″

SSA 115 OTM: 2493 fps

SSA 110 TSX: 2575 fps

I had exactly 5 rounds of the 85 TSX TL and didn’t have any left for the SPC II 1:11″ twist. I’ll get those next time. I didn’t measure accuracy closely but I was shooting about 1.25″ to 1.5″ at 105 yards with everything. Neither barrel showed better accuracy than the other. The brass looked exactly the same. With a suppressor or without, didn’t make any difference.

More testing will follow with the SSA Tactical loads


18″ SPR 7.62mm / .308 Winchester Range Report

We put our new 18″ SPR 7.26mm/.308 Winchester rifle through its paces at the range this week. This rifle features our .308 Winchester compatible 7.62mm NATO chambered barrel. The overall performance was flawless. The Chrony was set up 15 feet from the muzzle, and we loaded up with Hornady 155 gr A-Max and Winchester 168 gr Ballistic Silvertip ammo. The A-Max achieved a muzzle velocity of 2685 fps, and the Silvertips hit 2365 fps. Reliability was perfect. At the end of the session we had a nice pile of .308 brass sitting at 3:30 about 10 feet away. Our MA-TEN based BR-X rifles were designed to go bang every time the trigger is pulled, because we know your hunting trip or your life may depend on it.

The first session showed good accuracy with 1.5 MOA 5-shot groups. Took the rifle out for a second range session because we knew it could do better. The first trip out we found that the trigger was terrible. It was a basic GI single stage trigger, but something was obviously wrong with the mating surfaces between the hammer and the sear. This time out we put a Timney single stage trigger in the rifle with a 4.5 lb pull. What a difference. Here’s our setup:

18" BR-X on the bench


And the view down range:

BR-X on the bench, downrange view

Targets are 105 yards from the muzzle. No Chrony on the second day as it was raining and miserable. This time we brought several different types of ammo including 150 gr Hornady SST Superformance, and hand loaded 150 gr SMK and 150 gr Barnes TSX

The Bank

And the results

Range results

Starting at top left: the first group was fired with 150 gr Sierra Match King over 46 grains of H4895. The first shot is for sight in, then moved a few clicks left and called it good for testing. As you can see, there are many three shot groups that would be great, but three shot groups are for sissies, so I manned up and shot 5 in each group. This is more a testament to my shooting still than to the rifle. Our professional shooter Dave wasn’t available for this range day so I had to do the dirty work myself. First group came in at 1.36″, measuring the groups as the largest distance between the centers of any two shots in the group. This produced a respectable 1.34 MOA.

The second group at the top right is 150 gr Barnes TSX over 46 grains H4895. Woof! I didn’t even bother measuring that one. From the left at the bottom: 150 SMK over 43 gr Varget, 150 Hornady SST Superformance, 150 Barnes TSX over 43 gr Varget. The rifle obviously likes the SMK’s, and with some time put into load development, should be able to push MOA or better. This will be our focus in the future. I’m also looking forward to the weather warming up and a nice sunny day at the range. Once I get a good load dialed in, it will be time to call Dave to put up some real groups.

Bison Carbine with Ops Inc 12th Model Silencer

Silencers really make shooting fun. We brought a lightweight 16″ carbine to the range for some fun with an Ops-Inc 12th model silencer.

BR-15 carbine, Ops-Inc 12th Model silencer

Silencers are expensive, the wait for the paperwork to go through is a drag, but they’re worth the trouble. Once you shoot suppressed, you’ll never go back. And you’ll never move to California.