Had several PM9's, myself. Every one of them had a bit of a gap between the base of the frame and the magazine floorplate. Watch "the pinch" while doing a combat reload (swapping in a new mag), if you haven't experienced it yet. Not as bad as hammer bite, but it'll wake you up. Never did have any bad "rubbing" on my hands. Had the standard Kahr floorplates as well as the pinkie-extension Pierce plates. Other than "the pinch," I wouldn't be too concerned with it.