I have an sc and the fit is good and tight and it shoots real nice. The GI unit I qualified with sounded like a can of marbles when you pulled it from the holster, and you couldn't hit the sand pile let alone the target. Sounds like a lot of dry/dirty shooting.
Mines a little loose in comparison to my SA champion which doesn't have any wiggle at all. My SW will wiggle a little if unloaded, but you have to grab the slide and wiggle pretty hard and it only moves a little.