100% Risk Free, Lifetime Warranty The Monstrum Tactical Laser Bore Sighting Kit for .22 to .50 calibers, are precision machined from high quality aluminum ensuring a perfect fit in the chamber and true aim when adjusting optics, sights, etc. Each comes packaged with the necessary batteries and is immediately fully operational. Remove the batteries to turn off the laser and store for future use. Includes: Laser Bore Sighter, 10x Adapters, (3) LR44 button cell batteries Compatability: From .22 to .50 calibers. The follow are just some caliber examples but not limited to: 223, 556, 270, 22-250, 243, 308, 30-06, 338, 30-30, 300, 7.62x39, 7.62x51, 7.62x54r. LED Type: Visible red laser Laser wavelength: 630-680 nm Laser beam: < 5mW Sighting range: 20-30 yards Dot size: 1.5" @ 100 yards Warranty: Lifetime