10-09-2021, 09:46 PM
(This post was last modified: 10-09-2021, 09:48 PM by lazyengineer.)
FWIW, and not saying this is your case, but I did get the exact same symptoms. In my case it was an AA 20" HBAR, and it took me a while (and a few boxes), to figure out that the barrel extension wasn't on very tight. They used some kind of Loctite, and when cool, it was super tight and great. But if I put a few round through it warmed it up, it got loose, and the barrel would droop in the receiver and within the free-float handguard. You could wiggle it with your hands. Let it cool down, and it tighten back up enough you couldn't notice, and stopped drooping. I pulled the barrel off, and sure enough, was able to unscrew the barrel extension right off with my hands.
I contacted Alexander Arms, and they did fix it; though the jerks made me pay the shipping to send it back to them. I'm irritated by that, since it was their defective worksmanship, but whatever. They then sent it back and my headspace and timing were still good. Not sure how you can tighten up the threaded barrel extension without affect those things - but they did. It works great now.
I contacted Alexander Arms, and they did fix it; though the jerks made me pay the shipping to send it back to them. I'm irritated by that, since it was their defective worksmanship, but whatever. They then sent it back and my headspace and timing were still good. Not sure how you can tighten up the threaded barrel extension without affect those things - but they did. It works great now.