Features: Universal laser bore sight kit fits .22 to .50 caliber rifles and pistols Fits firearms with a minimum barrel length of 3 inches Simply slide the laser into the barrel, shine the red dot down range at 25 yards, adjust crosshairs to the laser and then head to the range Should only need 2-3 rounds to finish sighting in Includes adapters for 12 and 20 gauge shotguns Laser crosshairs adapter will level your rifle and then level the crosshairs. This adapter goes over the laser bore sight and projects a red laser line that is calibrated to a bubble level Brightest, most powerful laser legally allowed to produce Laser dot can be seen over 100 yards away at night