White Label Armory's 5.56 NATO M16 Bolt Carrier is a black-finished bolt-carrier component designed for compatible AR-platform firearms. Available configurations of White Label Armory's 5.56 M16-style bolt carrier groups have included a billet-steel extractor and a black nitride finish, with the carrier manufactured for the M16-pattern operating system. | White Label Armory 5.56 NATO Billet Extractor Black M16 Bolt Carrier