450 Bushmaster Nitride Bolt Carrier Group (BCG)

450 Bushmaster Nitride Bolt Carrier Group (BCG)

This 450 Bushmater Bolt Carrier Group (BCG) is manufactured by Swan Machine specifically for AR15Parts.com.  It is built to Mil-Spec standards that include a 9310 steel bolt assembly that is nitride treated for durability, a nitride treated 8620 steel carrier assembly, and a properly staked gas key (grade 8 fasteners).

Specifications:

• 450 Bushmaster
• AR15/M16/M4 Mil-Spec Profile 
• 8620 Steel Carrier
• 9310 Steel Bolt
• MIM Steel Extractor w/ Crane (NAVSPECWAR) o-ring & spring
• Mil-Spec Staking on the Keys
• Magnectic Particle Inspected (MIP)
• Shot Peened
• Black Nitride finish
• MADE IN USA