Blackhawk makes an offset picatinny mount that allows accessories to be mounted at either the 1 or 11 o'clock positions. I have one on order to put my Bushnell TRS-25 red dot off to the side. My 3-9x scope is mounted on a 1" riser with Leupold see thru rings so I can still use the iron sights.
Here's a picture..
Cabela's: Blackhawk!® Offset Rail Adapter
Here's a picture..
Cabela's: Blackhawk!® Offset Rail Adapter