It's a relativity easy repair with no change in receiver metal temper at the locking area. You will need a piece of hot rolled steel the width of the receiver area .5 x .125 thick after the scale has been removed. Don't use cold rolled steel as it will buckel from the heat, and don't use tool steel flat stock as it will harden from the heat and you will encounter problems when cutting the dovetail. Drill a 1/4" hole dead center through your new piece to be welded to the receiver. When the piece is located in the correct position, Tig weld up the 1/4" hole so the puddle is slightly raised above surface of the part. This will give you material to skim the top when your finish machining it. I would advise against putting the dovetail on the part prior to welding it on as you risk a slight misalignment perpendicular to centerline of receiver. 1.5 hour maximum time to repair.