Sightmark .17HMR Boresight (SM39022) Chamber the Sightmark®.17HMR Boresight in your .17HMR 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. Includes a carrying case, two (2) AAA batteries, and instructions