I have a 1896 Krag that was left to me by my grandfather. It has 3 threaded holes on the left side of the receiver, (opposite the bolt handle) They are 1 3/16" apart. Are they for a scope mount? The gun still shoots and I would like to mount a scope on it if possible. It is NOT a collectors piece. The actions is brite metal and it has a full lenght stock, like a manlicher. Please advise.