Embodiments herein relate to the field of firearm accessories, and, more specifically, to reusable laser sighting devices for rocket launchers and other large weapons, particularly reusable laser sighting devices that allow retrofitting of existing weapons inventory. Some embodiments include a base plate that is configured to be permanently coupled to a rocket launcher, such as the M72 LAW, and a laser module configured to removably couple to the base plate. In various embodiments, the systems disclosed herein permit a the module to be removed from the base plate of a spent rocket launcher, and coupled to the base plate of a new rocket launcher, thereby reducing waste. In various embodiments, the laser module may be factory calibrated with respect to the base plate, and therefore once the base plate has been fixed to the rocket launcher, no field calibrations of the laser module are necessary.