J-Tech Laser Emergency Stop Switch for the MakerMade Laser Module
JLaservideo
LaserMax Red Laser Sight S&W J-Frame
Amazon.com : Crimson Trace LG-350G Lasergrips with Green Laser, Heavy Duty Construction and Instinctive Activation for Smith & Wesson, J-Frame Round Butt, Defensive Shooting and Competition : Sports & Outdoors
CO2 laser - DIAMOND J-series - COHERENT - pulsed / gas / infrared