I own an Erma/Iver Johnson 22 "M1 carbine" that is missing the rear sight(very common for this rifle). Replacement rear sights and screws are hard to find. The reciever is dovetailed to accept a standard 22 scope mount. I was wondering how much it would cost to take an actual M1 carbine rear sight(flip or adjustable) and machine the base so it would fit the reciever and add a set screw to hold it in place. TIA !