6.5 Type II Grendel Nitride Bolt Assembly 223bcg - 9310 Vac-Arc Steel Bolt

- 9310 Vac-Arc Steel Bolt Nickel Boron Coated

- 8620 Steel Carrier DLC Coated

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

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 one for you

- Bolts Engraved with 9310/MPI

6.5 Type II Grendel Nitride Bolt Assembly 223bcg - 9310 Vac-Arc Steel BoltMade 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