Brass Red Laser Boresight.   Caliber-specific brass cartridge boresight, perfectly matched to 7.62x39mm barrels for precise pre-zeroing. Crafted from solid high-quality brass for stable barrel fit and long service life. It features a 635-655nm visible red laser with safe under 5mW output, clear aiming dot visible from 10 to 75 yards. Compact 39g lightweight design, easy to insert into barrels to align optics and save shooting ammo. Ideal for range and hunting calibration.