.223/5.56/300BLK Nickel Boron Bolt Carrier Group

Nickel boron coated for lubricity and wear resistance advantages over regular nitride coatings. Also helps with carbon cleanup.

Machined to exact mil-spec dimensions. Heat treated, shot peened and relief cut.

Bolt Features:

Carpenter 158 steel
Heat treated
Shot peened
NiB coated
MPI tested
Bolt Carrier Features:

8620 steel
NiB coated
NiB coated bore
Full auto M-16 style/full mass