A SightmarkA(R) Laser Pistol Boresighter gets you back on target faster and without wasting precious ammo. It's convenient, accurate and easy. All you do is chamber the unit as though it were a round, and a red laser dot will show you exactly where your aim will land the shot. From there, you can adjust your scope or sights without ever firing a shot! Several caliber-size housings are available to fit all of your favorite firearms. Don't replace... re-calibrate with a SightmarkA(R) Laser Pistol Boresighter! Perfect for hunters, competitive shooters and law enforcement Easy to use Improves accuracy Reduces ammo waste Compact, lightweight and durable Includes carrying case Several sizes available Powered by common AG5 button cell batteries (included) Order today!