An Armalite one piece mount will move it about an inch forward. A LaRue SPR will give you a little more than that, and the LaRue EER gives you about 3" or so...it's really made for longer eye relief scopes, but would most liekly work for you.
An Arms 36EX will give you another 4" or so (don't quote me...you'll have to look at 'em, but I think it's around 4").
Yankee Hill makes a 5" and 7" rail extender/riser. I just got the 5", and it works great...but I'd recommend the 7" in case you needed to space the mounts out more. This is also by far the cheapest solution, since these things are only $35 a pop, .vs $200 for a LaRue. Now, the Yankee Hill won't work for the high speed low drag crowd, but if you're just looking for a quick, affordable solution, and you don't intend to stand on the scope once you mount it on the rifle, it should work fine.
I've seen some of the AMRS 36s going for dirt cheap in the EE lately...you might want to cruise there for a couple of days and see what you come up with. For example, I saw a 36S EX for $65 last week. I was looking for a EX, or I would have snagged it.
Don't forget an ARMS 38 EX or S EX...they have the rear BUIS built in, if you're intrested in that.