Abstract: The present invention relates to a retrofittable laser system (10) utilizing miniaturized components which are insertable into a pistol barrel (24B) of a pistol (24) which emits a laser module light pulse (12C) when a pistol firing trigger (24F) activates a pistol firing pin (24E). The pistol (24) further comprises a pistol housing (24A) and a pistol ammunition chamber (24D). The retrofittable laser system (10) comprises a laser module (12) which comprises at least one laser module pin (12A). The laser module (12) further comprises a laser module diode (12E) having a laser module diode driver circuit (12EA) electronically connected to the at least one laser module pin (12A). The laser module (12) further comprises a laser module graded index optics (12D) integrally associated with the laser module diode (12E).