Bear Creek Arsenal

This BCA AR-15 complete 5.56 Nato pistol length upper has a 7.5" M4 contour barrel with a parkerized finish, and features a 1:7 twist rate, with a pistol length gas system. It includes a 6.5" MLOK rail, an M4 flat-top upper receiver, and a flash hider. This 5.56 Nato upper is compatible with any mil-spec AR-15 lower. More Information SKU UHA621N-556PM47.517P-7M3 Weight (lbs) 2.750000 Magazine Capacity N/A Length 7.5 Profile M4 Contour Twist 1:7 Finish Parkerized Material 4150 Chrome Moly Vanadium Thread Pitch 1/2 x 28 Caliber 5.56 NATO Feed Ramp M4 Feedramp Flutes Non-fluted