Crimson Trace CTS-1520 Dovetail Mount Red Laser Sight Combo Kit, Smith and Wesson/Glock, 5 MOA, Black, 01-30000201

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.