Was having some failures to lock back on some gen 1 and gen 2 140mm 9mm magazines. Ordered some new sti springs and some new gen 2 126mm mags as well bc why not. Springs fixed my problem with the old gen 1 and gen 2 tubes, thing is the new gen 2 126mm 9mm mags right out of the box wont lock the slide back at all. Anyone have this issue? Should I order some new guts, different brand? I'm a little stumped on what to do. Brand new to 126mm sticks and no wizard to 2011 either. Any help would be great, thanks.