My question is to bigcraig is that I have heard mags need to be "tuned" and I could add base plates like I have on my Zev 34 but I have not had one malfunction with my stock mags. Also I purchased 2 more STI stock 140 mags and haven't had any issues with those either so even though your opinion isn't high of the "stock" mags I don't think I'll change them because everything is running well. I personally can't knock anything on the DVC or the STI mags.