Aero Precision APRH100185C .308 / 7.62x51 M5 Bolt Carrier Group (BCG) finished in Nickel Boron. This is a high-quality, drop-in BCG for AR-10 / LR-308 pattern rifles (M5 / DPMS pattern compatibility — confirm fit for Gen II-style receivers). The carrier is machined from 8620 tool steel with forward-assist serrations, and the bolt is machined from 9310 steel. The Nickel Boron finish reduces friction, eases cleaning, and offers excellent corrosion resistance.
Key Features
Platform: M5 / .308 / 7.62x51 (AR-10 / LR-308 / DPMS pattern).
Carrier material: 8620 tool steel, forward assist serrations.
Bolt material: 9310 steel, MPI & HPT checked.
Finish: Nickel Boron (NiB) for low friction and easier cleanup.
Weight (approx): ~17.6–17.92 oz (typical for this model).
Profile: Full-auto / M16 cut (standard M5 profile).
Note: installing a full-auto profile BCG in a semi-auto firearm does NOT make the firearm full-auto
