Free Shipping on order $125 or more

5.56 Bolt Carrier Group – Nitride


In stock


This is a complete bolt carrier group for AR15/ M4 style 5.56 rifles, fully assembled and made in the U.S.A.! This bolt is full auto rated with a Black Nitride finish, machined to USGI standards. This carrier includes a Mil-Spec gas key that has been heat treated per GI specifications. The gas key is secured via USGI domestic Grade 8 fasteners. These hardened parts insure a stronger staking for a properly functioning gas system.

The bolt assembly is machined from 9310 steel, Nitride coated and shot peened for increased strength. Nitride is 15% stronger than Nickel Boron. Included is an extractor and ejector made from tool steel with T.E.A Extractor Spring. All BCGs are high pressure tested and magnetic particle inspected as part of the quality control inspection to ensure superior quality. Finally, all KDG bolt carrier groups are test fired for functionality and proper operation.


  • Black Nitride coating
  • Full auto rated
  • 9310 steel
  • HPT Bolt (High Pressure Tested / Proof)
  • MPI Bolt (Magnetic Particle Inspected)
  • Shot Peened Bolt
  • Gas Key Hardened to USGI Specifications
  • Grade 8 Hardened Fasteners, Key Staked Per Mil-Spec
  • Tool Steel Extractor
  • T.E.A Extractor Spring

Additional information

Weight 13 oz