I purchased this complete upper two months ago and couldn't be more impressed. I also bought a BCM lower from Ranier as BCM had none in stock. Fit and finish are superb. I have only fed it American Eagle 223 55gn for barrel break in then switched to some "budget" PMC xtac match 77gn otm to get an idea of the rifle's accuracy potential. First/only group measured 3/4" at 100yds. Unfortunately I had to quit for the day after that. This was off sandbags sitting on a relatively unstable bench. I look forward to testing this and other ammunition from the concrete bench at my range. Recoil was minimal (even for an AR). I'm sure the rifle length gas contributed to that. Thank you BCM.
The upper shoots really well, have a viper pst 1-4 on top of it and with 55gr pmc FMJ keeps a group of 1 moa at 100yds and holds a 1/2 moa with 75gr bthp Hornady. Loving the upper
Amazing shooter! Shoots one ragged hole at 100 yards. Runs flawlessly.
Very pleased with this upper, fast shipping, clean our of the box, zeroed in no time. VERY accurate barrel and you can't beat the keymod rail.
I have always wanted to put together a MK12 and there was no other brand I wanted than BCM. I can confidently say that I'm not disappointed, not only is this product well manufactured but it performs great on paper too! Thanks for such an amazing product!
This fully built upper arrived quickly and well packaged. Everything was assembled good, and there wasn't a ludicrous amount of extra lube.
It is very accurate.
Nice fit and finish, I Have it on a spikes lower with an st-t2 buffer. Its operates flawlessly, 200 rounds through it and am shooting sub moa with iron sights at 50 yards with target range ammo.
amazing complete upper! I did a lot of research before I finally pulled the trigger, very happy with my decision. The build quality and attention to detail is second to none and the upper performs as advertised, extremely light with the KMR hand guard.