Originally Posted by WolfPak
I don't believe you can tighten it up because it is designed to be loose. It was designed with the AK47 theory of loose tolerances in mind.
BS. Nothing else but BS. I have a very early 500, no rattle. If you are walking, you may get some wiggle. I hunt, so my hand is always on the foregrip. I've had mine for close to 20 years, bought it used. Never had an issue.