Buckmark sights that allow access to removal screw

I have a BM standard, put Williams (short one) Fire Sights on it and did not notice until I fired it and at home trying to clean it. The sight covers the rear screw so I can not access the screw to remove the slide without removing the pin or completely unscrewing the vertical screw adjustment. Seemed to me to be a crazy design. So, does anyone make a fiber optic sight that allows access to the means to take the gun apart? I know there are people who say the BM does not need that, but after 50 years of shooting, there are times to "really" clean the gun. And I do not care to completely unscrew my sights to do it. I am just funny that way I guess.