You have just the upper that you shoot? Does it fit and work on a regular ar lower? Serious question, very interested in answer. ThanksI have an upper I'm thinking about selling or trading if you're interested, with maybe 4-5 mags to go with it. I just don't shoot it, maybe put like 5 or 10 mags through it. It's ran reliably with no problems. The only weak link I've found is the mags, if you don't load them to full capacity they run great. I would load like 20 rounds in each one and that solved the issue. There's probably better mags out now but I've this since they first came out.https://palmettostatearmory.com/psa...length-7-62x39-classic-upper-with-bcg-ch.html