These sights are used in the manufacture of MR/DR/XR/CR pistols. Our blacked out steel rear sights have crisp serrations on the back to eliminate glare. The front face of the rear sight is high enough to allow emergency racking using the sight. Serrated black sights give a crisp sight picture and do not distract your eye if you are mostly focused on dot shooting and regard the irons as a true backup only. All MR/DR/XR models use the same 0.355" Rear Sight, however, front sight heights have varied over time due to manufacturing changes, different co-witness requirements.