The NCSTAR Laser Cartridge Bore Sighter provides precise rifle sighting for .308 caliber firearms with reliable red laser technology and durable construction.NCSTAR Laser Cartridge Bore Sighter.308 caliber compatibilityBrass construction for durability and precision fitBatteries included for immediate useEasy to use designMatte blued finishEssential tool for shooters and hunters who need accurate bore sighting for their .308 rifles saving time and ammunition during the sighting process.