Mine is tight, but yes it does move a little and, if you move it just right, it will make a little noise. The movement is so small that it does not affect accuracy in the slightest. Compared to a number of other pistols I have, this one is the tightest. My S&W Pro is the loosest slide to rail fit and the accuracy of that pistol is very good as well. As said earlier, it is probably a non-issue as long as it shoots well.