Are you sure it's the gun????????????:690:
Good try but there is no right-hand slide release lever on a USP or USPc. LOLRight hand slide release lever.
Have you tried cocking the hammer back and see if the rattle persists?Ok so after closer inspection I'm 95% sure that the rattling is come from the hammer spring or strut. I don't see any way I can fix that and as far as working, the pistol performs a function check just fine. Should I take it to an armorer and have them look at it?