This BCA AR-15 complete 9MM pistol upper has a 10.5" M4 barrel with a parkerized finish, and features a 1:10 twist rate, with a blow back gas system. It includes a 9.5" MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and right-side charging (Gen2) handle (patent protected) and will fit on a mil-spec AR-9 lower.
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|Material||4150 Chrome Moly Vanadium|
|Thread Pitch||1/2 x 36|
|Feed Ramp||Single Feedramp|
|Charging Style||Right Side Charging|
|Classification||Complete Upper Assembly|
What mag works best for BCA 9mm's?
Check out our AR9 and Genesis Mags here: https://www.bearcreekarsenal.com/guns-parts/ar-9/ar-9-parts/magazines.html
What magazine/ammo does BCA recommend for each caliber?
These are brands that BCA uses in the facility to test fire our products. However, there are several brands that will also function properly. Caliber Magazine Ammo Grain Weight Ammo Brands BCA Status AR15 - 223/5...
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