WBP 5.56 AKM Bolt Carrier with Piston Black

WBP 5.56 AKM Bolt Carrier w/Piston - Black WBP 5.56 AKM Bolt Carrier w/Piston - Black Cold Hammer Forged Gas Piston is Threaded and Riveted Into Place Zinc Coating WBP 5.56 AKM Bolt Carrier w/Piston - Black. Cold hammer forged 5.56 bolt carrier W/ piston. These new unserialized mil-spec carriers are featured in all of the WBP firearms we import and they come ready to be polished for smoother action. These have a ZINC coating for lubricity and rust resistance.