I have had 4 Tanfoglio guns, 2 fullsized 9mm, one a Witness, 1 compact 9mm, and a fullsized .45 Witness, all worked perfectly, with both factory and aftermarket mags. Right now, I still have one of the compact 9mms, and a fullsized 9mm, both are "Mossad" guns, identical to the earlier "small frame" witness. The compact one is in satin nickel, and the fullsized one has a satin nickel frame, but the slide is stainless. I've never seen one like it before.
I guess I've been lucky, but all 4 of my guns have been great! Zero mag issues. The only issue was a mag I bought online for my compact works fine, but the follower is different than the other ones, and it doesn't keep the slide open when it's empty.