Sightmark's Wolverine FSR Red Dot Sight is specifically built for the AR platform. The rugged Wolverine line of sights from Sightmark delivers unlimited eye relief and first-class battery life using just a single AA battery in a durable shockproof design. It is housed in a single piece of 6061-T6 aluminum that is rubber-armored and protected by a scratch resistantanti-reflective lens coating. Fog proof and nitrogen purged the Wolverine sight is designed to provide shooters the ability to take aim in a variety of conditions and temperatures ranging from -22 to 122 F. It has an adjustable mount height and are compatible with Picatinny mounts.Designed for short-range engagements and quick target acquisition, the responsive Wolverine FSR 1x28 is a durable red dot optic with a 2MOA dot reticle. The Wolverine's extremely low power consumption delivers an incredible 1000000 hr battery life on low and 6 years continuous use on setting 6 from just a single AA battery. Rubber armored and constructed of a 1-piece of 6061-T6 aluminum, the Wolverine is waterproof, fogproof and shockproof. Glass is protected by a scratch resistant, anti-reflective lens coating. All Wolverines have night vision modes, making them compatible with night vision devices. The FSR has ergonomic digital switch controls, making it quick and easy to operate when seconds count. Wolverine FSRs include - a rubber lens cover, picatinny mount and riser for absolute cowitness. Feature: 6 years of continuous battery life Digital switch brightness controls Scratch resistant, anti-reflective lens coating Fogproof, nitrogen purged Rubber armored, 1-piece 6061 T6 aluminum housing Adjustable mount height Powered by a single AA battery Very low power consumption Protected adjustment caps IP67 waterproof rating - Submersible to 1m/3 feet Night vision compatible Shockproof design Wide range of operating temperature, -22 to 122 deg F