Osprey Global 5.7x28 FN Red Laser Boresight Brass Small 5.7x28 FN Boresight. Made from durable brass it is easy to use precisely calibrated to position shots within 1.5 inches of center and backed by Ospreys lifetime warranty. Specifications for Osprey Global 5.7x28 FN Red Laser Boresight: Manufacturer: Osprey Global Fabric/Material: Brass Laser Output: 5 mW Weight: 34 g Wavelength: 635 - 655 nm Features of Osprey Global 5.7x28 FN Red Laser Boresight Ensures your first shot is on target saving you time and ammo. Package Contents: Osprey Global 5.7x28 FN Red Laser Boresight 3 LR626H batteries Osprey Global 5.7x28 FN Boresight: 5.7x28 FN Red Laser Boresight Brass Small