The Crimson Trace CTS-1520 Dovetail Mount Combo Kit lets you mount a best-in-class red dot on your trusted Smith & Wesson or GLOCK pistol. No need for expensive gunsmith work to cut your slide or worrying about which Red Dot will fit. This kit uses the existing dovetail notch to secure the low profile adapter plate to the slide. Then simply attach the included Red Dot sight to that adapter plate. The Dovetail Mounting Kit is compatible with some of the most popular Smith & Wesson and GLOCK pistols on the market today. Now you can use the best red dots on the market with the pistol you have trusted for years. At Crimson Trace failure is not an option.