pretty much says in the title. ive been looking for a red dot sight for my full size usp .45. most of what ive seen the slide is milled out in the rear to add this. but ive also noticed it has 2 punch pins in the top too that I'm not sure what they are for and could be used for a sight? I will be getting the front of the slide milled anyways so I want to know if I should do this while its already in the shop or just leave it. I tried to find out on my own but there was no clear answer I could find online.