Just got off the phone from talking to Blue Line.
Even tho' my wife is not the original owner, they are sending us the replacement ambi-safety under warranty without charge. I was told that they put a premium on customer service, and it looks as though that isn't a hollow statement.
I ordered an enhanced upgrade kit with the SS guide rod and alignment cone as well. Coupled with a GSG spare parts kit I already have, I ought to be able to keep that gun running indefinitely. Oh, and a set of factory grips with the relief cut in the right grip panel.