Solomone Cavalli 223 Bore Sight Laser Red Dot In-Chamber Cartridge .223 REM / 5.56 Red Dot Laser Sighter Our boresighter is made of premium aluminum- solid construction & superior quality 223 REM / 5.56 BORE SIGHT, made to fit the .223 / 5.56 chamber, caliber specific. High accuracy, laser display 1.5" dot at 100 yards Designed for fast gun zeroing and sighting range 15 to 100 yards Enhances precision and accuracy , save ammunition and money