You might consider the Vortex cantilever mount. These are available in 2" and 3" set back and for 1" scope tubes or 30mm scope tubes. These are very nicely finished.
Burris P.E.P.R. mounts are similar and one model has quick disconnet flip lever mounts.
These will mount on the Red Lion 8 slot rail, but I like the 11 slot rail or 19 slot rail for more options for front to back adjustment.
I have, and use, both Vortex and Burris cantilever mounts. Both hold the scopes at eye levels that are exactly where I want them to be. No extra risers needed. Both allow exact eye relief adjustment.
Other quality manufacturers make similar mounts.
The online auctions have many similar mounts, including inexpensive imported versions.
http://www.vortexoptics.com/product/cantilever-ring-mount-for-1-inch-riflescope-tube-3-inch-offset
http://www.burrisoptics.com/ar-p.e.p.r.-scope-mount
:nopics:
So, here they are. This is the Vortex, 3" offset with 30mm rings, on a RLP forend with a 19 slot rail. I know this works for me: :rayof:
Note: in actual use, I move the scope forward to get proper eye relief. I took these photos just to show how far back the scope and/or mount will go, if desired.
This is the Burris P.E.P.R. mount holding a Burris 1-4x24 (30mm tube) MTAC illuminated scope. It is mounted in the next to last rear slot on a RLP fore end. I could move it to the rear slot and shift the scope further forward, but this slot keeps the throw lever from getting in my way when loosening / tightening the fore end ring. I get the proper eye relief, even with my stock fully extended.
I don't know if these would do what you want to do, but here is an example of the inexpensive models. This particular USA online auction seller offers their cantilevers in 1" or 30mm at $14.99, with free shipping. Many of the inexpensive mounts do not have enough space between the rings to allow a regular scope to fit the turrets well or have enough movement for the scope to move back and forth for fine tuning of eye relief..
