of this type of firearm recoil spring guide 2 is modified to house a concealed battery compartment to power a laser that is mounted in a chassis adapted to be attached to the front face 104 of slide 4 further the chassis is provided with holes corresponding to barrel hole 103 and spring recoil guide hole 3 so that the normal functioning of the firearm does not have to altered this enables the handgun to function in every respect the same as a firearm not equipped with laser sight if the sight is not turned on yet when the laser sight is needed the invention is easily activated by a conveniently placed switches will be discussed below fig2 is a cross sectional view of the laser diode sighting system 10 attached to the autoloading handgun shown in fig1 in accordance with the invention the laser diode sighting system 10 has five subsystems laser diode chassis 12 retaining bushing 36 membrane switch 18 recoil spring guide battery pack 14 and the trigger switch 16 the laser diode chassis 12 is dimensioned to have the same profile as slide 4 chassis 12 also has holes 103 39 and 3 39 that correspond to barrel hole 103 and spring recoil guide hole 3 since the barrel 30 of the sig model p288 tilts upward when slide 4 is in the fully retracted position hole 103 39 is modified accordingly also hole 3 39 is dimensioned to allow recoil spring guide 2 to slide through when slide 4 travels backwards since system 10.