Ah, yes, I found the reference, I missed it. So, BCA states on their website that their 7.63x39 uppers are now all being made with 300BO ramps instead of m4's. FastSmitty, if your barrel is relatively new it should 300BO ramps, not m4:Flip that....
Bear Creek is typically very "budget brand". Take that meaning how you will.
BC-15 | 7.62x39 | 10.5" Parkerized Heavy Barrel | 1:10 Twist | Carbine Length Gas System
Try out an AK-47 but in the improved AR-15 platform! This Bear Creek Arsenal 7.62x39 pistol barrel adds the high value to your build you are searching for!
www.bearcreekarsenal.com
Also, as someone else mentioned, very short distance from the gas port to the end of the barrel. Not a whole lotta dwell time. Maybe ask for pistol length?