The Smith & Wesson M&P M2.0 Slide Cut For the Holosun 509T footpprint updates your trusted M&P9 M2.0 pistol to take advantage of today's great optic sights. INCLUDES: SLIDE AND OPTIC HEIGHT SIGHTS ONLY. Use your original frame assembly, barrel, and recoil spring. For use with 4.25" barrels. FeaturesOptic Ready - Milled to directly mount any Holosun 509T pattern optic.Co-witness Height White Dot Sights - Provides an optimal sight picture in poor lighting conditions. Allows use of open sights when optical sight is mounted. Note: Check your current slide for M2.0 markings. This will not fit prior versions.