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The BCA AR-15 Complete Upper Assembly has a 16" heavy barrel profile made of 416R stainless steel with a stainless finish, a mid length gas system and a 1:8 twist. The assembly includes a 12" mlok rail, an upper receiver, a bolt carrier group, a charging handle and a bird cage flash hider. It is chambered in 5.56 NATO and machined with M4 feed ramps in the barrel extension. from Bear Creek Arsenal (Product UA556MM41618(SS)-(12)MLOK)

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