BCM® MPI COMPLETE BOLT CARRIER GROUP

Machined to USGI specifications, the BCM complete bolt carrier group (auto version) for your AR15, M16, or M4 has a parkerized exterior with chrome lined inside carrier.

This M16/M4 carrier includes the proper Mil-Spec chrome lined and heat treated gas key per GI specifications. The gas key is secured to carrier via USGI domestic manufactured Grade 8 fasteners and is properly staked per Mil-Specs.

THESE PROPERLY HARDENED PARTS ENSURE A STRONG STAKING AND PROPER GAS SYSTEM FUNCTIONALITY.

BUILT FOR PERFORMANCE FROM THE GROUND UP

The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158 steel, shot peened for increased strength. The complete BCG includes tool steel machined extractor and ejector, BCM Extractor Spring, and is HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected).

Prior to shipping, all BCM Bolt Carrier Groups are test fired for function. As such, the Bolt Carrier Group will show handling marks consistent with these quality control procedures.