The question is are you going to get the full rail for the gss or go with a scout scope? How do you like the rifle? 16 in or 18?
I have no intention of putting glass on my GSR but if I ever do it'll be either a Burris 2-7 scout or one of the Leupold scout type offerings. It's got the 16" barrel (which actually measures somewhere around 18" with the muzzle device).
After I got it it quickly became my favorite long arm. It's a great utility rifle that can take a beating. When I was working on the ranch it was bounced around on 4 wheelers, in the back of trucks etc. One time I even threw it off of a 4 wheeler while chasing cows (I slowed down and as gently as possible tossed it into some grass along a fence to be picked up later). It's got plenty of scars in the wood as well as the metal but it still shoots true. it's not a perfect rendition of the scout concept if thats what you're looking for but it is a light and handily little carbine in a more than adequate caliber that came from the factory with very robust and accurate sights.