Stag Arms High Pressure .308 Bolt Carrier Group (Nitride)

Stag Arms builds this .308 bolt carrier group as its high-pressure carrier, with a bolt machined from 9310 steel rather than the Carpenter 158 that is standard on 5.56 bolts. 9310 is the preferred bolt steel for large-frame ARs because 7.62x51 generates higher bolt thrust than 5.56, and the bolt lugs are where that load concentrates. Stag high-pressure tests (HPT) and magnetic-particle inspects (MPI) the bolt, the two procedures that catch a bolt prone to early lug failure before it ships.

The carrier is 8620 steel finished in black nitride, with a properly staked gas key, and it drops into DPMS, LR-308, and SR-25 pattern uppers. Black nitride runs harder and cleaner than phosphate, so carbon wipes off rather than baking on, which matters on a heavier .308 carrier. This is a semi-auto-correct AR-10 carrier for a standard build; pair it with a tuned buffer and an adjustable gas block to smooth the .308 impulse.

At $199.99 the Stag lands below the premium Aero Precision .308 BCG while delivering the HPT/MPI bolt testing that matters most on a large-frame gun. For a general-purpose or duty AR-10 where you want a tested high-pressure bolt without paying the top-tier price, this is the value pick.