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This BCA 300 Blackout 15" Mlok Complete Upper consists of a 16" parkerized barrel with a 1:7 twist, housed in a 15" Mlok rail. It is chambered as a .300 Blackout with a carbine length gas system. The upper receiver is assembled with our BCA M4 Flat top upper receiver and the standard bolt carrier group and charging handle are included. Pair this upper with our BCA lower assembly for your ideal AR15 rifle. BCA DOES NOT recommend using steel cased ammo in our Assemblies or Rifles. from Bear Creek Arsenal (Product UA300CM41617(P)-(15)MLOK)

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