Action looseness when open is irrelevant, what counts is when it's locked up, you can shoot it without the forend on!! Shooting without the forend on is a good way to determine if the forend is affecting accuracy, usually being too tight is the culprit, too loose isn't usually a problem. If you want to tighten it up a bit, shim between the spacer and the forend on a wood stock as directed in the FAQs, but too tight can cause accuracy to go out the door, if it's a syn stock, you're in for more work.
Tim