1.75" isn't going to cut it. I've tried the 2" offset mounts, and they only get some of my scopes far enough forward.
I've seen this one online:
http://www.dnzproducts.com/freedom-...-picatinny-rail/30mm-forward-ring-mount-black
But, it doesn't look anywhere near as solid as the Nightforce, and is nearly the same price. I don't need the 20 MOA the NF mount has, but it isn't going to hurt anything.
The top and the bottom are mine:
That is how forward I am mounting the scopes. Love the rigidity of the Spuhr, but I need to bridge the hand guard with it, which I don't like, and it is around 1.47" high.
PRI makes a rail with 3" overhang that is 0.450" high. With Seekins 0.920" rings, the scope would be at 1.370". The rail doesn't look as rigid as the NF either though. The GG&G scout rail looks nice and rigid, its 0.5" high but I'm not sure how much it overhangs the front of the receiver (specs. like that should be listed, seriously!), but I would need to use the 0.870" rings, and there would be interference between scope cap and the rail. The back would need to be machined to be like the RRA scout rail. The NF A192 seems like the best option if it hangs out far enough...