Received my BCA Upper couple of days ago.
7.62X39, 16" HB
Only found one flaw, a nick on the rear lug. Not a deal breaker, filed it smooth and covered the spot with a sharpie.
Added an AR stoner Linear brake, Vortex Cantilever one piece Base and
a Nikon P7 3-12X40. Also installed a Kaw Valley H3 Tungsten Buffer 5.4oz
Already had a H2 4.7 oz, but this heavier buffer actually ran my .556 upper better as well.
Mag was a 10 round Duramag SS, performed flawless.
Started with Golden Tiger FMJ at 25yds.
Three of four rounds went into same hole, one round did not fire, light primer strike. I tried Golden Tiger, Tula, Brown Bear, Herters, several rounds of each. Only three GT and one Tula went bang.
My reloads lit off no problem. Looks like I will have to order an enhanced firing pin or modify the one I have.
Overall very happy so far and at the moment I would rate this upper 9/10.
Next range report will tell when I can put 100 rounds or so down range of different ammo types.
Just for reference, the white dots are 1/2"