This HK USP Compact Suppressor rear sight features our SlantPro design and has a single tritium insert. The SlantPro style is designed with concealed carry (EDC) as it's primary focus. The sight is contoured and completely snag free. The rear face is serrated and slightly slanted forward to help eliminate glare from any light source. The single tritium insert, centered under the rear notch (for low-light and night time shooting) aligns vertically with a single tritium front insert (when used as a set) and creates a distinctly clear sight picture. This vertical alignment is proven to be faster and less confusing for the human eye.