Available in either a 3 MOA dot or 6 MOA dot, the Vortex Razor Reflex Red Dot Sight is a high-end open-top reflex red dot sight. It has a clear and crisp, large window that provides edge-to-edge sharpness with a wide field of view. It is protected by a thick and durable aluminum housing. Red dot size is available in 3 MOA or 6 MOA for your choice between a more precise aiming point or one that’s extremely quick to acquire on a handgun. Side-load battery tray makes for quick battery changes without removing the sight from your firearm. It is a perfect fit for shotguns, handguns and rifles. Lightweight at only 1.3 ounces (2.4 ounces with the low Picatinny mount--included), yet rugged and durable. With XR fully multi-coated and ArmorTek coated glass, the Vortex Razor Red Dot features a rugged aircraft grade aluminum body. The one piece chassis, this unit can stand up to the toughest abuse and is 100% waterproof. The Vortex Razor Reflex Red Dot Sight comes with a picatinny-style mount, hex adjustment tool and is covered by the Vortex VIP Unconditional Lifetime Warranty. The battery life is up to 150 hours on its highest setting and up to 30,000 hours on its lower setting.