Viridian Weapon Technologies HS1 Hand Stop with IR Laser, M-LOK Mounting Retail Box, Black 912-0040 Viridian's new HS1 is the world's first AR hand stop with integrated IR 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.