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- Power Spring Kit
- Enhanced Firing Pin Retaining Pin
- 9310 Vac-Arc Steel Bolt Nickel Boron Coated
62x39 Bolt Nitride QPQ
6.5 Type II Grendel Nitride Bolt Assembly 223bcg - Power Spring KitMade from 9310 Vac Arc Premium Carburizing Steel which has a high core hardness and high fatigue strength unlike standard Hot cold rolled 9310 steels. Fully Assembled Bolt Shot Peened MPI (Magnetic Particle Inspected) Power Spring Kit Black Nitride Coated
