LaserLyte universal laser BORE SIGHT kit fits .22 to .50 caliber rifles and pistols. SIGHT IN a rifle with only two shots INCLUDES 223 556 308 30-06 6.5 UNIVERSAL KIT includes all adapters that cover 223 556 5.56 nato 270 22-250 243 308 30-06 338 lapua 30-30 300 blackout whisper 7.62x39 7.62x51 7.62x54r and many more, batteries and a target also included FITS 3 INCH BARRELS simply slide this laser light into the barrel shine the red dot down range 25 yards adjust the crosshairs to the laser then go to the range to sight in should take 2-3 shots to be sighted in 223 LASER BORE SIGHT will sight in new scopes rings bases that were just mounted on the rifle. This system will also sight in laser sights and iron sights modern sporting rifles and muzzle breaks ADAPTER SET includes four adjustable pieces that include four screws and matching hex wrench These adapters will perfecting fit 22 to 50 weapons the system also includes batteries and a daylight laser target BRIGHTEST AND MOST POWERFUL laser we are legally allowed to produce. The bright laser dot can be seen over 100 yards away at night. Power Output: 630 - 670nm, &lt;5mW, Class: IIIa Laser is aligned to the center of shaft Push the laser into barrel, it centers itself Simple on off roll switch select your adapter size and go