.458 SOCOM / 450 Bushmaster Bolt Carrier Group Nitride QPQ 458bcg This is our new Nickel

This is our new Nickel Boron / Nitride Hybrid Bolt Carrier Group for the 5

For use with both Glock and Colt pattern lowers

Gas key staked to mil spec standards

This bolt carrier group is so strong that it's "SCRATCH RESISTANT

- MPI tested

.458 SOCOM / 450 Bushmaster Bolt Carrier Group Nitride QPQ 458bcg This is our new NickelThis is our 458 SOCOM 450 Bushmaster Bolt Carrier Group. This has the M16 Full Auto rated Carrier with an S7 Tool Steel Extractor for not only reliability but long lasting performance. This is a Mil Spec Bolt Carrier Group treated with our Nitride QPQ process having an overall hardness of 75 Rockwell. 8620 Steel Carrier 9310 Vac Arc Steel Bolt 4340 Steel Cam Pin S7 Tool Steel Extractor 4140 Steel gas Key Mil Spec Spring kit MPI (Magnetic Particle