The SPARC AR Red Dot Sight is a compact, rugged, and versatile reflex sight designed for AR15 rifles and pistols as well as other PDWs. The 2 MOA red dot is large enough to be easily acquired in close quarters but still precise enough to be effective at longer ranges. The SPARC AR uses a AAA battery to provide up to 55,000 hours of service. The sight comes with two mounts - one that allows for absolute co-witnessing and one that allows for co-witnessing in the lower 1/3.