Sorry to hear of your troubles Paul.

One issue with the 1911 magazines is they appear to leak after not much use and an early symptom is the pistol firing on full auto and/or the slide not locking back after the last shot. There is an easy fix though. The problem often stems from a leaky valve and tightening the valve often resolves matters. On the 1911, the valve containing the CO2 piercing needle has a reverse thread and after a few CO2 cylinders have been 'allen keyed' tightly, the valve can become loose as you are tightening the CO2 in the same direction the valve unscrews. Try tightening the valve a little to see if this stops the leaking.

I've not experienced such issues on my KWC Luger but the mag' looks like it works on the same principle.

Maybe you want to sue SIG for the broken slide like the U.S. Police officer who dropped his pistol, which then shot him in the leg

John