My carbine is currently equipped with a set of DD fixed irons, but no optic. I'm definitely comfortable with the irons-only configuration and very much like the way a sub 7-pound carbine handles. That said, I'm interested in adding a Scalarworks MRO bundle (which will still keep the rifle under 7 pounds).
I'm leaning towards keeping the DD irons and rolling with a lower 1/3 co-witness mount for the MRO. In reading the various threads about the MRO, it seems some find it works better mounted further back, just in front of the rear sight. If anyone is running fixed irons with the MRO I'd like to know how that combination is working for you, and where you have the MRO mounted.
TIA for any insight (or photos)!
http://www.canonshooter.com/photos2/bcmcarbine-1.jpg