The .17-.50 Caliber Muzzle Laser Boresighter takes the guesswork out of sighting your firearm. The Sight-Rite laser and unique adapter kit provides stable alignment producing accurate boresighting results. The versatile system will work with .17 - .50 caliber guns. Weighs 3.02 oz. Length: 5.66". Includes three LR44 lithium button cell batteries. 90-day limited warranty on parts and labor.