Euroarms is still in business. They have a website for which the source code is current.
Parts for that firearm should be available.
Don't know the value because I don't follow such things but you are at an advantage in coming to a fair price, because you know the history and probably, the condition of the piece.
Check successful sales of the piece on gunbroker and find out what folks are paying. Double check that against a different market to make sure that people on GB are not paying more than you can get a new one for, out of ignorance.
My reading of history convinces me that most bad government results from too much government. Thomas Jefferson