I saw the same post after I'd purchase the sights and it was already In the mail so I was a little concerned. Well, I installed them and my site picture is much better and I'm shooting better at 50', as far as the holster goes I only had the issue with my Fobus HK2 holster because it is a molded plastic. So for my SR40c the Mitch Rosen holster, Banshee holster from Wright Leather Works, and my N82 Tactical Pro had no issues at all with the Williams Fire Sights. In the end a good investment.