The BCA Brown Bear Upper Assembly has a 16" Parkerized barrel, 1:9 twist rate and a standard hand guard. This complete upper receiver is chambered in 223 Wylde and machined with M4 feed ramps (both in the lower and barrel extension) and comes with a BCA BCG and charging handle. This is the perfect upper for your next build. BCA DOES NOT recommend using steel cased ammo in our Assemblies or Rifles.
Weight 7.0000 Length 16 Profile Contour Twist 1:9 Finish Parkerized Material 4150 Chrome Moly Vanadium Thread Pitch 1/2 x 28 Caliber .223 Wylde Feed Ramp M4 Flutes N/A Gas System Carbine Gas Block System 0.750 Gas Hole Diameter No Charging Style Rear Charging Color No
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