This NBS Black Nitride .308 Complete BCG is compatible with any AR10, .308 or 7.62×51 rifle that follows the DPMS pattern. The carrier includes forward assist serrations and the bolt is (MPI) certified.

Bolt:

• MPI Inspected
• 9310 Alloy Steel
• Hardened Steel Extractor
• Milspec Gas rings (3)
• Black Extractor Insert
• 2 Viton O-Rings

Bolt Carrier:

• 8620 Steel
• Heavy Duty Full Cut Design
• Grade 8 Gas Key Screws, Staked
• Gas Key Material – 4140

Cam Pin:

• 8620 Steel Nitride Finish
• Firing Pin:
• Mil-Spec Firing Pin