Sig Sauer Romeo MSR red dot sight. Features a black 1x20mm compact red dot sight with housing made from aircraft grade aluminum. Has a 2 MOA dot with 12 brightness settings, adjustable elevation and windage controls, and waterproof housing. Has an M1913 and absolute co-witness mount for your AR. Includes one CR1632 battery with 20,000 hour life. New # SOR72001