Vortex Razor red dot is an open-top reflex sight built for top-tier performance and incredible versatility. The large, clear and crisp window provides edge-to-edge sharpness with a wide field of view and is protected by a thick and durable aluminum housing. Dot size is available in 3 MOA or 6 MOA for your choice between a more precise aiming point on a rifle 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. A great fit for rifles and shotguns. Rugged and durable, the Razor comes in at 1.3 ounces (2.4 ounces with its included, low Picatinny mount). 150 Hour battery life on the highest setting & 30,000 hours on the lower setting. Lifetime Transferable Warranty!