This BCA AR-15 complete 9MM pistol length upper has a 5" M4 barrel with a parkerized finish, and features a 1:10 twist rate, with a blow back gas system. It includes a 4" MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and Gen 2 (patent pending) Side Charging handle and fits on a mil-spec AR-9 lower.
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|4150 Chrome Moly Vanadium
|1/2 x 36
|Right Side Charging
|Complete Upper Assembly
What magazine/ammo does BCA recommend for each caliber?
Caliber Magazine Ammo Grain Weight Ammo Brands BCA Status AR15 - 223/5.56 MagPul PMAG, MFT 55, 69, 75 Sierra AR15 - ...
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
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