F-1 Firearms DuraBolt Black direct impingement full auto rated M16/M4 bolt carrier groups are compatible with mil-spec receivers and associated components.
The DuraBolt Black is enhanced through Chemical Vapor Deposition (CVD) technology and is the hardest, smoothest, and most wear resistant carrier group available. The DuraBolt Black offers the lowest coefficient of friction on the market as low as .02 after our micro finishing process.
The complete DuraBolt Black Carrier Group comes with:
- DuraBolt Black Bolt Carrier Group
- 8620 Aircraft Quality Steel
- Chrome Lined interior
- DuraBolt Black 5.56 Bolt Assembly
- Carpenter 158® Bolt w/Spring and Ejector
- DuraBolt Black 17-4 Firing Pin w/Chrome Finish
- DuraBolt Black Cam Pin
- F-1 Firearms 100% Product Guarantee
- 5.56 BCG Weight: 11.55 oz.