The VAPRLSRKM Ncstar Compact pistol red laser with strobe fits most rifle and pistol Weaver Picatinny MIL-STD 1913 rails, on full size and compact framed pistols with 1.7"-2.0" accessory rail. Compact pistol blue laser sight is fully adjustable for windage and elevation. Laser has button on each side of laser body to allow the user to turn laser On/Off. Holding the button down while the laser is On, turns the Strobe feature On/Off. The laser features our Patented KEYMOD™ undermount for future KEYMOD™ accessories that can attach to the underside of the laser.