It tends to go with the brand and the barrels that you have. The TM's are horrible for it because they're made so that they fit snug, not tight. Makes a difference over a longer period of time.
Myself, I've got a CA metal body and the Army Code L119A1 barrel. It was tight enough that I actually had to hammer the barrel in. This sucker won't wiggle for the life of me. Add to that a solid RIS kit and there's no wiggle...nothing.