If the deep cleaning did not clear mine up the next move was to remove the dot. But I dont feel the dot weight should make a difference since steel is milled out of the slide and the dot is made of aluminium so there should not be too much weight difference. Yes, worth considering but should not be the issue. That said the mounting screws may be causing an interference issue.
My best guess is that something is keeping the slide from making it all the way to the rear.
My best guess is that something is keeping the slide from making it all the way to the rear.