This Nightforce scope is 1 of 22 released SOCOM optics that were used for Mk20 rifles. This is one of the extreme few from the 2019 GovPlanet auction.
This is one of the only legal used MILSPEC scopes on the market if they end up out here. The only legal MILSPEC scopes night force released was an overrun of 200 ARMY SPEC scopes back in 2011 and those did not have the UID because they never made it to the military they were just overrun. They refuse to sell MILSPEC to civilians without exception.