Mountable on either a weaver or picatinny rail, the Firefield® 10-40x50 Tactical AO Riflescope is equipped with a second-focal plane red or green Mil-Dot reticle for a variety of tactical applications. Featuring advanced precision multi-coated optics and a 50mm objective lens, the 10-40x50 Tactical Riflescope offers exceptional clarity for long-distance target sighting and competition shooting. Engineered for precision accuracy, the unit features an adjustable objective lens to correct parallax and a 1/8-inch click MOA adjustment to ensure accurate shot zeroing and bullet placement. Its easy-grip, open windage and elevation turrets allow the shooter to quickly fine-tune the reticle for bullet drop, ensuring even greater accuracy. Weatherproof, shockproof and fog proof, the 10-40x50 Tactical Riflescope is operable in temperatures between -20 degrees and 60 degrees Celsius, making it a versatile tool for any environment. Weighing less than two pounds, this riflescope is extremely lightweight, yet capable of withstanding up to 1,200 g's of recoil. Battery life for the adjustable illumination is between 80-150 hours.