Bolts and Carriers

At Bison Armory we use bolts by Stag/CMT, LWRC, and LMT. Our bolt carriers are made by Young Manufacturing.

Bolts

Our standard bolt is made by Stag / CMT. Most of our customers use this bolt and we've never had one come back because of a failure in the bolt body. Stag bolts are cost effective and will run reliably in your rifle.

 Stag / CMT bolt

Our first bolt upgrade is the LWRC Advanced Combat Bolt. The bolt features a nickel finish for reduced wear, a fully supported bolt face, and a dual extractor spring design.

LWRC Advanced Combat Bolt

 The LMT Enhanced Bolt is similar to the LWRC ACB and features a fully supported bolt face, dual extractor spring design, and NP3 nickel based finish. The LMT bolt is also designed with a reduced bolt lug opposite the extractor which is intended to make the bolt stresses more symmetric during the cycling/firing process.

LMT Enhanced Bolt

Bison Armory uses JP Enhanced bolts for our BR-X line of rifles.

JP Enhanced .308 Bolt

Bolt Carriers

Bison Armory offers four bolt carriers from Young Manufacturing. We only carry AR15 bolt carriers as the difference between YM AR15 carrier and an M16 carrier is extremely minimal (weight difference is 0.2 ounces). There is no reason to use an M16 carrier in place of a YM AR15 carrier if you do not have a select fire weapon. We are happy to special order YM M16 carriers for our customers if requested.

Our standard carrier is the Young Manufacturing AR15 phosphate finished carrier. It is made to the same standards as the other carriers made by YM but comes with the standard black phosphate coating.

Young Manufacturing black phosphate AR15 bolt carrier

Young Manufacturing chrome AR15 bolt carrier

The Young Manufacturing chrome National Match AR15 bolt carrier is 1/2 oz heavier and has more surface area at the carrier front. According to YM, these additions provide improved alignment of the bolt carrier as it moves in the receiver, tighter tolerances, more consistent bolt-lockup, and generally much smoother operation. This bolt carrier causes less wear, improved accuracy, and overall better function.

Young Manufacturing chrome National Match AR!5 bolt carrier

The YM chrome NM carrier with side charging handle is identical to their regular NM carrier except for the addition of the side charging handle. This carrier is intended only for use in upper receivers that have a side charging handle slot, such as the Mega SBU side charge upper receiver.

Young Manufacturing chrome National Match AR15 bolt carrier with side charging handle

Bolt Carrier Groups

Whenever you purchase a bolt and carrier together from us we will ship them as an assembled bolt carrier group, complete and ready to shoot.

Bolt Carrier Gas Key Staking

Young Manufacturing does not stake their bolt carrier gas keys, and they do not recommend staking. We have found through testing that staking with a MOACKS tool absolutely increases the security of the carrier key screws. You can run the carrier either way.