Viridian's HS1, AR hand stop with integrated laser sighting device. Utilizing M-Lok mounting, grip activation buttons, adjustable windage and elevation and an ergonomic design. 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 green laser sight for aiming. The HS1 is designed to fit directly to MagPul M-Lok rails. If you have a picatinny rail, you can purchase a M-Lok rail adapter.