Dynamic Munitions Bolt Carrier Groups are specially made on high end Swiss machinery to have exacting tolerances and surface finish. Each piece is coated in Nickel Boron which makes it resistant to corrosion and makes cleaning much easier. MPI tested and ready to install. Proudly made in America.
Carrier: 8620 Steel, nickel boron coated
Bolt: Nickel boron coated Carpenter 158 steel, heat treated and shot peened
Gas Key: 4130 Steel, nickel boron coated
Cam Pin: 4340 Steel, heat treated, nickel boron coated
Extractor: Manganese coated E4140 Steel, Mil Spec heat treated and shot peened
Firing Pin: AISI 8740 steel, chrome coated
Caliber: 223/556 NATO, 300BLK