Every since I bought my Ruger SR40c when it goes to load the last shell in the magazine it jams,so I figured it might have weak springs in the magazines. I got 3 new ones last spring and decided to take them and the old ones out to see what they would do. Other than one not extracting there were no problems with any of them,even the old ones. Beats me what was going on before,maybe something just needed broke in or cleaned better.
I noticed if I don't have the magazine pushed "completely" in then it can cause problems. My Kimber is the same way.
Hey SH, Force some 45s thru it , that will break it in real good, It wont never jam again.. Just tryin to help. Jim