Just became the proud owner of a 4566. With it came 5 magazines, two of which were still in the packaging (BONUS!) One of the magazines leaves a round in the frame when I eject the magazine....but one round needs to be chambered for it to do this. Swapped out the magazine for a new one and I do not have the problem anymore. I noticed the floor-plate on the old one doesn't have the same resistance as the new magazine. Can anyone point me to a good source for those springs. I figured asking here will keep me from spending too much time finding a good source.....