Ya the crossfires are a but fat. I heard that you can trade the older regs in for a discount one of their new ones though, which is shorter. You'd have to call and ask them about that.
I don't know who makes a double dovetail anymore. You'd have to check around I guess. I's easier just to use a shorter or thinner reg.
ETEK 3LT, with 14" critical .680 barrel and cure 3 + bolt F/S