I just bought an Interarms markX in 30-06 and I want to put a reciever sight on it. I noticed there are two plugged screw holes on the side behind the bolt handle. Are these pre-drilled holes for a reciever sight? It would work out great if they are for that. Anyone know?

That is what they are for. If you mount one, you will likely have to remove some wood to fit it.

Thanks, are they for a particular brand? I've never owned a rifle with one on it so I really have no idea.

The MarkX uses the same screw location/spacing as the FN, so any Williams or Lyman for an FN will fit.

Thanks lee440.