I probably have 200 rounds or so through my PA-10. It's run really well with all kinds of factory loaded .308 - everything from Tula to match ammo. It didn't like white box Winchester 7.62 NATO but it didn't upset me too much - just kept running .308. I've adjusted the gas block screw several times, but admittedly didn't close it all the way and work my way up like I should have.
Recently I've started making my own hand loads. I've yet to get them to run reliably in the gun, having FTF problems any time I load more than 1 in the magazine. Today I was at the range and after making an adjustment to the AGB screw I fired another round, went back to adjust again and it was gone. When I got it home and removed the handguard the spring was still in the hole but the screw is long gone.
I have a couple of questions. 1) Will PSA still warranty it if I've changed out muzzle devices (just a standard brake). 2) What will happen if I run the gun without the screw? Is it just essentially wide open at that point and the same as not having an adjustable gas block? Or is it just the opposite and won't send any gas back into the system without the screw? 3) Will PSA sell me one if I call and ask? I'm calling tomorrow just thought I'd see what feedback you guys here have. Thanks!