Handy, fun little device. - Viridian OpticsPlanet Exclusive HS1 Laser Hand Stops

This item arrived with battery installed, worked right out of the box. Installation pretty straightforward, M-Lok easy. Green Laser is very bright and easily visible in daylight to 150 feet or more. Installed on AR style pistol. Forward hand position to operate laser may be a little awkward when firearm is positioned to look through red dot or iron sights, but much more comfortable and natural when held lower, because you just point and shoot, no need to sight through optics. Works fine as a hand stop otherwise, I keep my hand/fingers behind the stop when I am not using the Laser. If finger positioned in front of the stop it will press the button, the little green button is very sensitive and laser will activate with any light touch. There is no constant on setting, only press for on or release for off.