"Chamber the Sightmark Laser Boresight in your .243, .308 or 7.62x54 rifle like a regular cartridge, and a red laser dot shows exactly where you're aiming. Ideal for hunters, competitive shooters and law enforcement, this device significantly reduces wasted cartridges and shells. Simply adjust your sights or scope, and save your extra ammo for the hunt. This device is tested and recommended by the National Tactical officers Association. Features: Includes a carrying case, three (3) AG3 batteries, and instructions. Precision accuracy Reliable and durable Fastest gun zeroing and sighting system Reduce wasted cartridges and shells Compact and lightweight Easy to pack and travel For the best selection of parts and accessories for your Modern Sporting rifle at the best prices, shop Palmetto State Armory!"