Ok I looked and could not find anything around, so I am looking at this front site to mount on a railed gas block,www.lewismachine.net/product.php?p=67&cid=2&session=f26cdf758cf3d4c1527b640c4ba63274, I am trying to find out if it would work or if anyone else has used one of these.

I would like to have anyone's input that has used one and what type of BUIS would work great with it to cowitness, any advice would be helpfull.