.458 SOCOM / 450 Bushmaster Bolt Carrier Group Nitride QPQ

This 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 Inspection) Tested

- Nitride QPQ treated