This BCA AR-15 complete 9MM pistol length upper has a 7.5″ Heavy barrel with a parkerized finish, and features a 1:10 twist rate, with a blow back gas system. It includes a MLOK rail, a branded M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a right-side charging (Gen2) handle (patent protected). This 9MM upper is compatible with any mil-spec AR-9 lower.
ALL OF BCA 9MM UPPERS ARE DESIGNED FOR USE WITH GLOCK STYLE MAGAZINES.
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