This BCA AR-15 complete 5.56 Nato pistol length upper has a 8.5″ M4 contour barrel with a parkerized finish, and features a 1:7 twist rate, with a pistol length gas system. It includes the new 5″ MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a rear charging handle. This 5.56 Nato upper is compatible with any mil-spec AR-15 lower.
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