Rosco Manufacturing, Bolt Carrier Group, 556NATO/300 Blackout, Fits AR-15, Phosphate and Chrome lined Finish, Black
Features
- carrier material: 8620 steel
- gas key: 4130 steel, attached with grade 8 hardware, properly staked
- cam pin: hardened 4340 steel
- firing pin: 8740 steel, heat treated, mil-spec, center-less ground, hard chrome plated
- bolt material: c158, , phosphate coated, mpi/hpt
- extractor: 4140 steel, heat treated, shot peened
- ejector: s2-s7 tool steel, shot peened
- phosphate/chrome bcgs ship with upgraded sprinco extractor kit
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