Magpul Enhanced trigger guard problem.

This weekend I installed the enhanced trigger guard. When I put the screw in and tightend it, the trigger guard does not tighten up, it is very lose. The directions say to be cautious about over tightening the screw. Any suggestions on fixing this problem. If this has been covered apologies.

Some of those screws are really tight when they go in. I know you don't want to overtighten it...but just make sure it's tight enough. I've had a few that are like that.

Thanks I will give it another go.