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This scope mount is bolted onto the receiver with two screws, a nut and a spacer using existing holes in the receiver. No drilling or tapping is required.
The first photo shows the existing ejector screw. Remove this screw and remove the rear sight pin and key. Get ready to assemble the new hardware as shown in the second photo. Remove the rear sight and plunger and spring as shown in the third photo. The fourth photo shows the installed scope. Time - 10 minutes. Easily reversible so save the original sight and hardware. I found out what a great shooter my No. 4 really is.
Addley Precision supplied the mount and hardware. I bought the scope separately.