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.