The Sightmark Wolverine FSR is a red-dot optic featuring a 2-m.o.a. reticle with 10 adjustable brightness settings, including two for use with night-vision. Energy efficient and powered by a single AA battery, the Wolverine FSR boasts a battery life of six years of continuous use on a medium brightness setting. Constructed of a single piece of 6061-T6 aluminum and wrapped in a rubber protective layer, the FSR mounts to any five-slot section of Picatinny rail and is configurable for both absolute and lower-one-third co-witness. Price: $150. Contact: Sightmark; (817) 225-0310; sightmark.com.