I have a Weaver tactical mount for the Aimpoint Comp series or any other 30mm red dot. This has an extra battery storage on the bottom too. This one is 1/3 cowitness.
This exact same one. http://www.midwayusa.com/product/898996/weaver-tactical-aimpoint-mount-with-integral-30mm-ring-picatinny-style-matte
$45 Shipped