I saw those on another site as well. I tried the AC Unity mags when they were being touted and honestly wasn't impressed. None of them fit out of the box. I had to sand the pad down on one to get it to fit and then it was still too tight, as well, I was getting failures to feed. I ditched them and moved on. I might try 1 of these to see how it works, but won't jump in with both feet like I did last time.