Get meticulous accuracy with the Sight-Rite Chamber Cartridge Laser Bore Sighter. Save time, money and ammunition by zeroing your firearm without firing a shot. From the very smallest .204 Ruger to the largest 12-gauge casing, their precision machined caliber specific sighters deliver consistent unmatched results. Get meticulous accuracy with the Sight-Rite Chamber Cartridge Laser Bore Sighter Save time, money and ammunition by zeroing your firearm without firing a shot From the very smallest .204 Ruger to the largest 12-gauge casing Precision machined caliber specific sighters deliver consistent unmatched results