Bought it yesterday and am really happy. After stripping off the Cosmoline it's clear that this rifle has hardly been fired. Even the stock is in great shape!. The serial number indicates that it was made in 1973 and it's possible that it has a chrome plated barrel but I can't really tell. The gas piston is clearly chrome plated.
I took extra care cleaning the firing pin. Thanks for the tip. Can't wait to get it to the range!