Can't help ya with the mag fit but check your pistol to see if you have this weird anomaly - leave it in the car (with a loaded mag), when it is less than 30*F (I guess the fridge works too) for about 5 hours. Take it out, drop your mag, make a strange "what the ....." expression
I have the same pistol, LOVE IT. I consider it one of the best out of the box fight pistols I have ever owned but the cold will do something funny to it. Try it.