Sighting System Instruments Sight-Rite Chamber Cartridge Laser Bore Sighters are a must have for any gun enthusiast. These Sighting System Instruments Bore Sights provide convenient and accurate sighting in for all types of rifles. Having a laser bore sight from SSI packed with the rest of your shooting supplies will help you save money, time and ammo. Bore sights deliver "on target" accuracy and take the guess work out of sighting in a scope. The SSI Sight-Rite Laser Bore Sights also have an all brass housing and are factory aligned.