I know Eric has been successful using Para pads on 140 mags, I can't get them to work. I've tried STI, SV old style, & I always get a stuck follower & a kinked up spring. With the 126 STI tube, the ribs go further down & my follower doesn't stick. With Para bases & Grams 11 coil guts, I get 25 reloadable. It's a handy mag.