Abstract: The present invention provides a partially-chamberable laser bore sight primarily for small caliber rimfire handguns and rifles of 0.17 and 0.22 caliber. The partially-chamberable laser bore sight has a chamberable generally cylindrical laser housing, which contains the laser diode and lens. A battery housing that is perpendicular to and rigidly joined to the cylindrical laser housing contains the electro-chemical cells that power the laser diode. For a preferred embodiment of the invention, the cylindrical laser housing, which is preferably made of brass, is inserted into a mold and the battery housing is injection molded around the cylindrical laser housing. An ON/OFF switch is also mounted on the battery housing. The chamberable cylindrical laser housing is inserted within the breech, or chamber, of the firearm. The battery housing, with its ON/OFF switch, protrudes from the breech opening.