If you are going to shoot service rifle it has to look like a service rifle.
I would look at White Oak Arms (WOA) and see if one of their service rifle uppers are available. Save the varmit upper for the vermin'.
If you can get 1/4 x 1/4 minute rear sights do it. You will glad you did in the long run.
God Bless our Troops especially our Snipers.