I was having some feeding issues with my Mp9 this past week at my local field. Plenty of misfeeds and jammed followers. I figured I had abused my magazines enough to warrant a tune up.
I was able to call up KWA and had four new magazine springs ordered.
Here is the result of 10k+ rounds used, left loaded overnight on several occasions and heat from hot California days.
So, If you guys are having feeding/magazine issues, be sure to check your mag springs!