This BCA AR-15 complete 5.56 Nato rifle length upper has a 16″ M4 contour barrel with a parkerized finish, and features a 1:8 twist rate, with a carbine length gas system. It includes a 15″ MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a left side charging (Gen 2) handle (patent protected) left ejecting. This 5.56 Nato upper is compatible with any mil-spec AR-15 lower.
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