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Wilson Combat: TRBCA – Wilson Combat Bolt Carrier Group Assembly, 223 Remington/556NATO, Magnesium Phosphate Finish, Black, Fits AR-15 TR-BCA TRBCA UPC 874218067922 featuring premium reliability. Supreme TRBCA – Wilson combat full auto bolt carrier group bcg ar15 m16 .223 rem 5.56 nato black magnesium phosphate finish mp 8620 carrier 9310 bolt shot peened hpt mpi marked 4340 cam pin dpms high pressure tested extractor e extractor spring crane o ring side battery key staked gas key premium reliable match grade drop in upgrade competition tactical build.
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