Rise Armament Bolt Carrier Group 5.56x45mm NATO Nickel Boron 4140 Steel RA1011NIB

RISE Armament advanced M16 Bolt Carrier Group (BCG) with Nickel Boron finish is manufactured with precision and individually inspected to ensure high-level performance. Coated with nickel boron to reduce friction and improve overall performance.

• Coated with nickel boron to reduce friction and improve the rifle's overall performance
• Unit weight: 11.6 oz.
• Individually MPI tested
• Bolt: 9310 MPI tested
• Carrier: 8620 tool steel heat treated and case hardened
• Gas key: tool steel - grade 8 hardened fasteners and staked properly
• Cam pin: 4140 steel
• Extractor: tool steel – shot peened