I recently acquired a 12 ga. J.P. Sauer "Royal" double. It was originally purchased (new)in Germany in 1963 by a gentleman stationed there with the air force. I think it returned to the U.S. with the original owner and was put in a closet for the next 43 years. It is in new condition. It doesn't appear to have ever been shot. It is very, very, very tight and stiff: it takes a good deal of effort to open and close the action. I showed it to a local "gunsmith", whose talents run mostly to replacing Rem. 1100 'O' rings, who opined that it just needed to have a few hundred rounds through it. Maybe so, but I'm not impressed with his expertise or advise.
The folks on this forum are the experts on doubles: does anyone have a suggestion for a competent smith in or near Denver? Anyone have any experience with these guns? Any ideas what is going on here? I'd sure appreciate any suggestions or ideas on this.