[lukemc01]

The Comp M3 might co-witness with the 30mm X-wide rings with the Ultimak m8 rail:

http://www.opticsplanet.net/aimpoint-sr-30-mm-x-wide-rings.html

Here's a pic:

with burris low rings:

But the Socom II rail won't work...

The pictures are not mine - I found them on this link:
http://www.ar15.com/archive/topic.html?b=6&f=6&t=295994