This BCA AR-15 complete 12.7×42 rifle length upper has a 10.5″ parkerized Heavy barrel, and features a 1:20 twist rate, with a pistol length gas system. It includes a 9.5″ MLOK Rail, an M4 flat-top billet upper receiver, a BCA AR15 bolt carrier group, a flash hider, and a right-side charging (Gen2) handle (patent protected). This 12.7×42 is compatible with any mil-spec AR-15 lower.
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