I solved this problem tonight, I think. Many of us suffer from rounds sliding forward and popping out of our spare mags. Well tonight I got this brilliant Idea!. File a little grove on the inside of the feed lips, towards the very back of the feed lip that the rim would then fit into when the cartridge is fully inserted into the magazine. Mind you this is a very shallow groove. The grove is not so deep as to cause the round to raise higher in the mag. but gives a little more friction to the rim of the round at rest to prevent it from sliding forward solely under magazine spring pressure. The grove is put right where the rim of the cartridge rests when fully inserted into the magazine. The grove can't be that deep or it will hinder the cartridge being push out of the mag by the slide. This has been an ongoing battle for me with my Kahrs. Many of my mags suffer from it. In fact it is one reason why I rarely carry my MK9 as I don't have 100% faith that when I insert a 6 rnd spare mag, that the mag will have all 6 in it. Many times I find after carrying for a hour or more that I may only have 2 or 3 rounds in the spare mag and the rest in the bottom of the mag carrier. A couple of my mags are so bad at this they will push the mag up in the carrier as they dump rounds out. I am not 100% sure that this is the end all fix, but it seems to be working all evening for me. So we will see. At least right now it is bringing me some rising confidence in the mag situation.