I want to put a red-dot on my .223 and I'd like to find one that will co-witness mounted to my SGM tactical quad rail. I'm looking at a number of different red-dots, but I'm not sure which ones (if any) will allow me to co-witness. Any help is greatly appreciated.
First, here's the rail I'm using - http://store.carolinashooterssupply.com/servlet/-strse-431/SAIGA-RIFLE-QUAD-SGM/Detail
Next, here are a list of the red-dots I'm looking at. (I've budgeted up to about $250, but would like to spend a lot less if possible).
Vortex SPARC - http://www.midwayusa.com/Product/682481/vortex-spa