GM Bolt carrier groups come MPI inspected. Perfect for your next 300AAC/5.56/.223 AR-15 build.
- Brand GORILLA MACHINING
- Caliber / Gauge 7.62x39
- Carrier Style Standard
- Platform AR-15
- Bolt Finish Parkerized
- Bolt Material 9310 Steel
- Carrier Finish Black Nitride
- Gas Key Staked
- Magnetic Particle Inspection Yes
Why do others substutute other inferior/untested steels? To decrease the cost of the part. Carpenter 158® is a high technology steel that is very expensive and can only be ordered in 20,000 lb mill runs. It is the only steel allowed by the US (and Foreign) Militarys for the very demanding needs of this high stress, critical part.
*NOTE: BARRELS & BOLTS MUST BE PROPERLY CHECKED FOR HEADSPACE PRIOR TO USE. FAILURE TO DO SO MAY RESULT IN DAMAGE, PERSONAL INJURY, OR DEATH*
Our products carry a lifetime, no questions asked, warranty. Simply put... Should any of our products fail, return it to us for a brand new replacement.