5.7×28 FN Boresight

The Osprey Laser Boresight is a red laser that ensures your first shot is on target, saving you time and ammo. Made from high-quality brass for durability, it is fast, easy to use, and cost-effective for accurate sighting. The precisely calibrated laser dot gets you within 1.5 inches of center. Backed by Osprey’s lifetime warranty. Material:  High Quality Brass Laser Wavelength:  635-655nm LED Type:  Visible Red Laser Sighting Range:  10-80 yards Dot Size:  1.5″ @ 100 yds Laser Beam: <5 mW Weight: 34g Batteries Model:  3 of LR41