The only thing i can think of is the gasket on the mag is pushing up on the nozzle too much, I checked the spacing of the lip to the nozzle and it looked to be just fine. Although what i did notice was if I slid the slide close to the gasket and let go the nozzle would literally get stuck and stop the slide all together
As you can see here, while with my regular mags it would slide forward no matter what. AS you can see the nozzle is even bending the gasket, what could I do about it? File it down??