Abstract: An electro-optic light pulse generator is completely contained in a gun sight holder and serves as the light source in any light responsive target shooting system. The gun sight holder is arranged for mounting on any long barrelled gun without need for modification of the gun so that its utility for shooting regular ammunition is not disturbed. The pulse generator is a laser or other light emitting unit, mounted with an optical system, electronic controls, and a battery power source in the interior of the unit. When the user "shoots" the gun, light pulses are beamed in the direction that the gun and its sight holder are pointed. The resolution of the system and its range are such as to warrant use with a telescopic sight and in one form of the invention, the gun sight holder is a telescope mount. The recoil of the gun or an action simulating recoil, is used to trigger emission of the light beam.