This BCA AR-15 complete 5.56 Nato rifle length upper has a 18″ Heavy contour barrel with a stainless steel and black nitride finish with bear claw flutes, and features a 1:8 twist rate, with a mid length gas system. It includes the new 15″ 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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