Each of our Mil-Spec Bolt Carrier Group Assemblies is made in the U.S.A. and feature full-auto capability, a shot peened MPI Bolt, 8620 Gas Carrier and Gas Key fastened with hardened Grade 8 fasteners. The ultra-hard and corrosion-resistant Black Nitride ensures this BCG's continued reliability and precision.

Features:
Nitride Finished 9310 Steel
MPI (Magnetic Particle Inspected) Bolt
Ground per True Mil Spec Specs
8620 Carrier (M16 full shroud) Heat Treated
Case Hardened Steel
Ground after Heat treat to MIl Spec
Gas Key Hardened to USGI Specifications
17-4 H900 Stainless steel Firing pin
Grade 8 Hardened Fasteners
Gas Key Staked Per Mil-Spec
Tool Steel Extractor
Weight: 11.456 oz