Triple K is not the best magazines ... but they make magazines for many obscure handguns ,,, like for my Star Model PS , Walther P38 and Walther PPK ... I would rather have a Triple K than no magazines at all .
Buttt...
Mec-Gar are top shelf and if I can get one ... will do so over any other .
They usually work very well and are well made magazines .
It don't get much better than Mec-Gar .
Your aftermarket magazine will probably work better when not full loaded ... and magazine springs need a little break in time ... Load it and leave it loaded , to help compress the spring ... one day you will be able to slip that last round in ... if not , don't worry about one round ...
Gary