Midwest Industries AR-15 Black Nitride Bolt Carrier Group For 5.56

Finish off your upper build with the Midwest IndustriesA(R) AR-15 Black Nitride Bolt Carrier Group For 5.56. This bolt carrier group (BCG) features an M16 style carrier constructed with 8620 steel and a corrosion-resistant nitride finish for unmatched strength and durability while the bolt features heat treated 9310 steel construction with a black nitride corrosion-resistant finish and is shot peened for an additional layer of strength for long-lasting field use. Further, the 4140 steel gas key features a corrosion-resistant nitride finish and is properly torqued with Grade 8 fasteners and properly staked to ensure reliability every time you head to the range. The 4140 steel cam pin is heat treated and shot peened with a corrosion-resistant nitride finish to ensure reliable extraction. Lifetime warranty. Order now! Made in USA.