A live ammunition optical simulator for a weapon disposed in a gun port and aimed through a separate view point. The simulator includes a visible light source, an infrared laser and a beam splitter located adjacent the view port and between the visible light source and the laser. The visible light source and the laser are oriented so that their respective beams lie along a common axis and strike opposing sides of the beam splitter. The laser beam is reflected by the beam splitter out of the view port to simulate the point of impact of a weapon projectile. The visible light beam is reflected by the beam splitter to a weapon user to provide a visual aiming cue simulating the path of a weapon projectile tracer. The weapon user, observing the scene shown in the view port through the beam splitter, can determine the point of impact of the laser beam by orienting himself so as to observe the visible light beam reflection in the beam splitter. A co-moving linkage, detachably connected to the weapon, effects pivotal rotation of the beam splitter to reflectively direct the laser and visible light beams in response to movement of the weapon.