I recently installed HD sights on my M&P. I like everything about the sites but the top rear edge of the back sight is sharp & is even or slightly protrudes past the slide. I carry AIWB and the sight irritates my dunlop if you know what I mean. I don't have this problem with my USPc. But the HD sight doesn't extend past the rear of the slide on the USP. Just wanted to hear others opinions that have noticed this sharp edge and maybe what they have done to carry comfortably. (No do more sit-ups remarks please)