Rcokdoc: They all were capable of having scope mounts added!
The scope mounts used the front bridge of the receiver (which is factory drilled and tapped) and the rear side bridge of the receiver (which is factory drilled and tapped for the dual purpose of accommodating a receiver sight and a side mounted scope base).
I forget which company made those type scope bases.
I seen it done though.
Long live the Riflemans Rifle!
Hold into the wind
VarmintGuy