Heckler & Koch VP9SK Slide With Tall Sights & Cover Plate – 51000950. The VP9 SK Optics ready slide quickly and easily converts a standard VP9SK OR VP9SK-B to an optics ready platform. Just install your existing barrel and recoil spring. Cover plate for optics cut. Black serrated rear and high contrast front sight. The Suppressor Height sights are specific for lower 1/3 co-witness with a mounted RMR. Other sights may vary.