The AimSHOT Universal Laser Bore sight is the most complete, accurate, easy and inexpensive way to accurately bore sight your weapon. AimSHOT offers the widest line of laser bore sights, and can bore sight anything from 17HMR to 50BMG. With our NEW Green Laser Bore Sight we have made it even easier to bore sight your weapons. The green laser bore sight is much easier to see in daylight and makes short work of your bore sighting session. Just slide the AimSHOT Laser Bore sight cartridge into the caliber-specific arbor into your chamber and a laser dot is projected down the exact centerline of your barrel for extremely accurate scope or sight adjustment. Cartridge arbors are meticulously engineered with precision for a flawlessly centered dot every time. All material that touches your rifle chamber is solid brass so there is no chance of scratching or marring your chamber and is much more dimensionally stable than other materials.