Nitride MPI 5.56/.223 AR-15 Bolt Carrier Group (BCG)
Product Specs:
.233/5.56 NATO
Salt bath nitride finish
M16 cut
9310 steel carrier
Carpenter 158 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.
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