That scope weighs 34 ounces. In fact, it weighs over twice what a 36x Leupold weighs.
You will have a near impossible task making 10.5 pounds. I said near because you can finally get the barrel down to a taper and length that will allow it, but in my opinion that approach is counterproductive.
There are much better scopes on the market for this application.. Just cirious, why would myou choose a Nightforce for a 10.5 pound Rifle?........jackie