There are lots of sig models, If the rear sight of your sig handgun is the same as the common sig P226 rear sight, it will fits. It basically replace the rear sight. See the installation video at the link below. https://www.youtube.com/watch?v=8QSxdZY723c&t=201s Designed for SIG P226 ect to fit following micro red dots 1. Ade Advanced Optics rd3-001, rd3-02, rd3-009 2. Sightmark mini shot reflex sight 3. Vortex Razor/Viper/Venom micro red dot 4. Burris Fastfire micro red dot(some burris red dot might require longer screws which is not included) 5. And similar Micro/Compact style mini Red dot sights Covered under Warranty for life Made using the highest quality materials This is a mounting plate to attach red dot to pistol, it is not a gun part. Attaches firmly to your firearm for sure performance in tactical situations Replaces the Picatinny mount packaged with the Red dot sight Sightmark, Vortex and Burris are the trademark of their respective owner, this mounting plate is an accessory made by a third party manufacture for connecting red dots to pistol. Red dot sight and pistol gun are not included, this listing is for mounting plate only. Mounting screws are included.