Viridian HS1 Laser Sight. Two jobs on your handguard usually means two parts. That is more to mount, more to snag, and more to fail. Most rifles carry a hand stop and an aiming device as separate pieces, and the rail pays for it. One Part, Two Jobs : A protective hand stop and a green laser in a single M-LOK accessory. Your rail stays clean and your support hand has a fixed home. On When You Grip : You shoulder the rifle, your hand finds the stop, and your finger lands on the pressure button. The green dot is on target before you think about it. Seen Fast : The green laser enhances visibility while aiming. Your eye picks it up and your aim follows. Set It True : Adjustable windage and elevation let you align the laser with precision. The dot goes where you set it. Simple Power : One 1/3N battery runs the unit. One cell to carry, one cell to change. Run a clean rail, or keep bolting on parts and hoping they stay out of the way. Brand new, authentic Viridian.