cant beat the quality of the RS regulate IMO -- comes in 2 parts. VZ304 is the rail mount with a rail type (proprietary? - Horse?) connection on the top. Then separately you chose the top half for a rail or the specific type of optic(s) you want to mount. Some are very specific to a particular optic style (e.g. ACOG)
I also have the high mount from Czechpoint-USA for those times when you want to set optic higher.
I have posted lots of pics on it throughout the forum.