Black Nitride 7.62x39 Complete Bolt Carrier Group (BCG) for AR15
This complete 7.62x39 AR15 bolt carrier group is fully coated inside and out with a durable salt bath QPQ black nitride ultra hard and slick finish for long life and ease of cleaning. Precision CNC machined from 8620 tool steel (carrier) and 158 Carpenter steel (bolt) and magnetic particle inspected and high pressure tested. The 4140 steel gas key is of standard diameter designed to fit gas tubes with an outer diameter of .172" to .179". This bolt carrier group has been tested by the US Army and fits standard AR15/M4s.
- 158 Carpenter Steel Bolt - Magnetic Partical Inspected, High Pressure Tested
- 8620 Tool Steel Carrier - High Pressure Tested
- Billet 4041 Steel Gas Key
- Grade 8 Fasteners
- Staked to Military Specifications
- Durable Salt Bath QPQ Black Nitride Finish - Inside and Outside