If you take Dizzums appropriate advice and you still can’t get rid of the clip, it’s definitely going to be something internal in the guns barrel system, how parts are connected, not Donny’s.
Now having said that, the clipping looks faint, as I’ve seen worse. Take two sizes in drill bits larger that the moderators exit hole and drill it out. That should fix the clip. This is a last case scenario, of course, as addressing the barrel system is the best course of action.
You never mentioned barrel droop- if you have that going on then for sure that’s the problem. There are makers of barrel clamps that help get rid of barrel droop