The HK Optics Ready Slide quickly and easily converts a standard VP9 OR VP9-B to an optics ready platform. Just install your existing barrel and recoil spring. Complete firing pin assembly. Cover plate for optics cut. Black serrated rear and high contrast tritium front sight. The Suppressor Height sights are specific for lower 1/3 co-witness with a mounted RMR. We do our best to prevent this from happening but it does occur on occasion. Doing that is against US and International Laws.