Nickel boron coated full-auto profile bolt carrier group.
Milspec Carpenter No. 158® steel bolt
Shot Peened Bolt
High pressure tested
Mag particle inspected
Gas Key Hardened to USGI Specifications
Gas Key Grade 8 Hardened Fasteners
Gas Key Staked Per Mil-Spec
Tool Steel Extractor
Extractor O-ring Insert
For packaging considerations, BCG will be packed dry. Nickel Boron's natural surface lubricity is not a substitute for normal rifle lubrication. Please follow all manufacturers recommendations for lubrication. It is possible to discolor the finish with dirty ammo or prolonged use without cleaning.