TacSol TSG-22 Mags don't fit AA Upper
Just as an FYI, unmodified Tactical Solutions TSG-22 15-round mags will not fit (unmodified) into an Advantage Arms Upper. I suspect they'd fit ok with a bit of modifying, but I'm not willing to cut down my new mags yet.
Also as an FYI, I'm having trouble with my TSG-22 kit locking back reliably on the last round. Nice kit otherwise, though. It seems to be running better the more I use it. Remington golden was about 95%. CCI minimags work great. I'm going to try Federal Automatch tomorrow.