This complete bolt carrier group is ready to drop in to your new AR-15 build. It has a nickel boron coating for extra lubricity and needs virtually no lube on the bolt and cam pin. The phosphate coated extractor has a surface finish that provides superior extraction. This is a top-quality full auto profile bolt carrier group with all parts meeting or exceeding Mil-Spec requirements.

Features and Specifications:
Manufacturer Number: ABABCGNiB
158 Carpenter bolt, heat treated, shot peened and MPI tested, nickel boron coated
8620 steel carrier, nickel boron coated inside and out
Full auto profile (does not enable full auto in semi auto rifles)
4130 steel gas key, nickel boron coated, properly staked
4340 steel cam pin, heat treated, nickel boron coated
Aircraft quality E4140 steel extractor, heat treated, shot peened, manganese phosphate coated
AISI 8740 steel firing pin, chrome coated