Mounted once, but never used. Comes with original case and warranty paper work. $480. Details as follows: The EXPS2 offers true 2-eyes-open shooting and provides an unparralled targeting experience. The all-purpose EXPS2 features easy-to-adjust side buttons and a quick-detach lever. It has a transversely-mounted lithium 123 battery. The increased height of the EXPS provides iron sight co-witness access in the lower third of the viewing window.