Just wanted to get some inptut. I've got a Rock River 6.8 and I'm thinking of either putting the Nikon prostaff 3-9by40 or the Buckmaster equivelant. Any one have any opinions? From what I see is that the only difference is the Buckmaster 92% light transmission compared to the Prostaff 90% which isnt much. and the Buckmaster is a little longer and a little heavier. I got to see the Prostaff on the rifle and it looked pretty good, but didnt get a chance to see the Buckmaster. Thx