The NCSTAR Red Laser Bore Sighter is designed specifically for 7.62X39 caliber firearms providing precise alignment for accurate shooting setup.NCSTAR Laser Cartridge Bore Sighter7.62X39 caliber compatibilityDurable brass construction with matte blued finishRed laser for clear visibilityBatteries included for immediate useEasy to use designEssential for zeroing rifle scopes and iron sights this bore sighter helps shooters achieve accurate alignment quickly and efficiently without wasting ammunition at the range.