ReluctantDecoy
NES Member
Those are 10 round Glock 17 mags. The 10 round Glock magazine bodies have considerably thicker walls and are probably more rigid than standard capacity mags.
Regardless of mag type, It's a known issue with TTI's.View attachment 373041
Yeah, that's what I meant by my admittedly poor description of "pinched". What were you using for springs? Longer extension springs aren't going to play well with this type of mag.