Viridian Weapon Technologies HS1, Laser Handstop, Red Laser, Picatinny Mount, Black 912-0058 Viridian's new HS1 is the world's first AR hand stop with integrated laser sighting device. Utilizing grip activation buttons" adjustable windage and elevation" and an ergonomic design" the HS1 is the perfect accessory for your tactical firearm. The uniquely placed pressure activated button makes the HS1 ideal for use on AR-style firearms as the laser can be activated when the shooter is using a variety of grip styles. The shooter gets all the protection of a hand stop while utilizing a highly visible red laser sight for aiming.