I just got a SSS Brass Limited Magwell and my TTI extensions are hanging up hard on the back edge (right where the screw holds the magwell on). I thought maybe it was something about my frame causing it, so I swapped the magwell over to my wife's M&P and it hangs up mags with that frame as well. On both guns, I can smack the mags and seat them, but then it requires a good rip to get them back out, certainly not dropping free.
I'm guessing I'll just need to take a file to it and move the rear edge back some....not what I was expecting when I ordered this magwell.