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- 8620 Steel Carrier Nitride Coated
- 4140 Steel Billet Machined Gas Key Nickel Boron Coated
the NiB P1W5XG coating has a polished gun metal look and WILL NOT FLAKE
Carrier is made with 8620 hardened steel and the bolt is Made from 9310 Vac-Arc Premium Carburizing Steel which has a high core hardness and high fatigue strength unlike standard Hot/Cold rolled 9310 steels
- Investment Cast with Secondary Machining
AR15/M16 Left Handed Nitride Bolt Carrier Group 5.56/.223 6.8 - 8620 Steel Carrier NitrideCarrier made with 8620 Steel and bolt made from 9310 Vac Arc Premium Carburizing Steel which has a high core hardness and high fatigue strength unlike standard Hot cold rolled 9310 steels. The nitride coating is the strongest plate available, it's the same protective finish that's used in gun barrels and CNC tool protection. If you're looking for a bolt carrier that's going to hold up against the roughest conditions then this bolt carrier group is the
