LANTAC USA M-SPEC BCG 5.56/.223 Black Nitride AR-15 Bolt Carrier Group

The LANTAC USA M-SPEC Bolt Carrier Group is a premium 5.56/.223 BCG precision machined to milspec dimensions and tolerances for the AR-15, M16, and M4 platform. It is built around an M16 full-auto profile carrier with increased mass for reliable cycling, and pairs a 8620 steel carrier with a shot-peened Carpenter 158 or 9310 steel bolt and 17-4 stainless steel components throughout the assembly. The entire bolt carrier group is finished in a QPQ Black Nitride coating that boosts corrosion resistance, reduces friction during operation, and stands up to hard use in the field or on the range. Whether you're assembling a duty-grade rifle from the ground up or replacing a worn BCG in an existing build, the M-SPEC delivers milspec-grade performance that has made LANTAC USA a trusted name in AR-15 components.