Slim Universal Laser Sight by Arma Laser - SR1 Stingray for Weaver Picatinny rails: Glock, H&K (not USP), Ruger, S&W (not Sigma), Taurus, Walther, 1911, Springfield, Beretta Pistols with Rails Easy to use Ambidextrous Slide Switch for easy on/off access on either side of the laser sight Slimmest Laser Sight available for railed pistols - Only 2" L x 3/8" H FITS most railed pistols with a 1.5" distance between the notch in the rail & the trigger guard 5 YEAR INDUSTRY LEADING WARRANTY! Ultra-bright Class 3R 635nm &lt;5mW red laser. Highest Laser Output Power by Law: 630-635 m, &lt;5mW CW with a 3 hr continuous on-time