Andy: This one is not hard to get shooting again. Buffalo Arms should have all the components you need. I had one of these a few years ago, and it was fun to shoot, and the round itself is very similar to many of the other military rifles of the era -- 11 mm Mauser, the Werndl round, etc. As to values, you can check the usual sites for what other Gras conversions are going for. They are not too common, and some French military collector would likely be very happy to take it off your hands if you don't want to shoot it.