I had a 1895GS for a while, and I put a Leupold VXII 2-7 on it. Then, I got the wild hair and changed it to a "scout" configuration (which I personally was not fond of), but my scout scope was a Leupold FXII 2.5x28.

I ended up trading the scout scope and rail for a 1961 Marlin 39A and the 1895GS for a Beretta 96 INOX pistol.