Every one I have taken off have been on there VERY tight and locktite'd as well. Looking at the gun from the rear(normal sighting), the sight comes OUT moving Left to Right. It goes back in using the reverse. I also noticed that each of my rear slide dovetails were cut slightly different. Some were larger than others.OK - Went to remove the rear site of my CQB to replace it with a 10-8 U notch. Loosened the set screw and used a sight pusher - I would not budge. - What is the secret it getting it off?