6.5 Type II Grendel Nitride Bolt Assembly 223bcg 4340 Steel Cam Pin Nitride

4340 Steel Cam Pin Nitride QPQ

-Black Nitride Coated

- Power Spring Kit

We use a 9310 Vac-Arc steel Bolt over the Mil-Spec Carpenter 158 Bolt because it's stronger and after many test firings and torture tests we've found it to not only last longer but to be more durable

- 8620 Steel Carrier DLC Coated

6.5 Type II Grendel Nitride Bolt Assembly 223bcg 4340 Steel Cam Pin NitrideMade 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