This BCA AR-15 complete 5.56 NATO rifle length upper has a 10.5″ M4 contour barrel with a parkerized finish, and features a 1:7 twist rate, with a carbine length gas system. It includes a 9.5″ MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a right-side charging (Gen2) handle (patent protected). This 5.56 NATO upper is compatible with any mil-spec AR-15 lower.
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