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These .223 / 5.56 / 300 BLK OUT Bolt Carrier Groups are Melonited, Full-Auto rated, are properly staked, and the bolts are Matched to the barrel. Check your local laws and regulations on ownership guidelines.

"Our Rosco Melonited Bolt Carrier Groups are designed to meet the modern-day carbine shooters requirements. We have also balanced input from our consumers and military end users in order to bring you the product you need, not just the one we want to sell you."

Rosco Manufacturing 5.56 / 300 BLK Bolt Carrier Group (Black Nitride)

  • Carrier Material: 8620 Steel
    Gas Key: 4130 Steel, attached with Grade 8 hardware, properly staked
    Cam Pin: Hardened 4340
    Firing Pin: 8740 Steel, Mil-Spec, Center-less ground & Hard Chrome coated
    Bolt Material: 9310, Properly Heat treated, MPI/HPT
    Extractor: 4340 Steel
    Ejector: S7 Tool Steel

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