Highpower, what a stupendous find...…...and at a yard sale. I've never seen anything like this at a yard sale. Heck, they're hard to find at a gun show in a condition like this. $400 is a steal. Congrats. I am not an expert to tell you what is right or wrong, but there appears to be enough right to make it a very interesting piece. It would be a story in itself to know the what for's and the who's that dictated any replacement of parts that have taken place.