Nickel Boron Steel BCG – 6.5 Grendel – Type II / 6mm ARC
A coated bolt carrier group for AR15, M16, or M4 made from Mil-Spec 8620 steel with a heat-treated gas key and various Mil-Spec components.
- The bolt carrier group is HPT and MPI tested.
- The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158® steel and shot peened.
- The gas key is secured with Grade 8 fasteners and properly staked.
- The firing pin has a chrome finish.
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