I love my AR-10. Had a few issues with some mags when I first got it. I just needed to disassemble them, work out some rough edges inside the mag body and everything has run smooth since then. I’ve used pretty much nothing buy surplus NATO stuff and never had problems.
I think some people don’t get past the break in (should a rifle need a break in period? Out of the box factory rifle, I don’t mind myself) before they start saying bad things about it. And of course, people love to complain, but rarely take time to say good things once the bugs are worked out.
I waited and waited and finally got the carbine. I put the Armalite recoil check on it along with a Night Force 1-4/ADM mount. Have a GG&G BUIS set coming in.
No regrets, love it!