I would be REALLY surprised if any combo of scope,rings,or base,would produce any degree of accuracy if mounted to the top of the carry handle.
Plus . . . the scope will be positioned waaaay too high for proper cheek weld. You need to get yourself a flat top for the longer range targets.
I remember the Colt scopes that they gave us for our different Colt "Commando Carbines". They were better than open sights . . . but not by much. --- SAWMAN