Since we cannot have flash hiders on our 15-22s in our liberal run state I decided to add one of tacticool22s non threaded barrel shrouds on mine. problem is that I usually shoot 200-250 rounds per range session and each time the screw loosens up. I have cleaned the screw and screw hole and applied some red loctite which has a tensile strength of 240 psi. I have no plans of taking the shroud off anyway. Hope that this works.