Premium Nitride MPI 5.56/.223 AR-15 Bolt Carrier Group (BCG)

Premium Nitride MPI 5.56/.223 AR-15 Bolt Carrier Group (BCG)

Product Specs:

• .233/5.56 NATO (Other Standard Rounds As Well)
• Ground & polished
• Salt bath nitride finish
• M16 cut
• 8620 steel carrier
• 9310 steel bolt
• 4140 steel extractor
• MIL-SPEC O-ring
• MIL-SPEC gas rings
• 4140 steel cam pin
• 8740 steel firing pin with hard chrome finish
• Magnetic particle inspected
• Proudly made in the U.S.A.