When I replaced 1 new skin (shape), for example, characters, weapons, etc. not one myself, but anyone in the server to see the new skin (rather than the default skin). For example I change skin M4A1 gun M16 guns, of course, everyone can see the new gun (M16). Sorry for bad english .
If script, please tell me
If you change YOUR files, then only you can see changed skins because other users didn't replace anything. As far as I know there's no script (or at least a good one) that does it. Simply because you can't simulate the moving animation of the skin.