Suggestions...if in France hunting for guns, other than the big museums in Paris, you want to spend your time near the Rhine River. Germany, Denmark and Netherlands are much better for firearms sites. Belgium is the Mecca for all of the arms industry in Europe; don't overlook the historic center of the arms trade.
Then face east, my friend. Prague, Vienna and Budapest are rich areas for gun enthusiasts. For the more adventurous, Zagreb, Beograd, Kragujevac, and Sarajevo are gun friendly.
Then there's gun valley...Val Trompia...in Italy. More high-grade gun shops per square mile in the valley outside of Brescia, than likely anywhere else in the world. Lots of hand made guns. World's best in fine engraving. Incidentally, one of my favorite engravers is a young French girl. She is exquisite. I can't even tell you what shop she works in, because the owners hide her very existence in the valley. She'll do a full coverage on a small Siler for about $1000.
Then for raw firepower and destructive devices it's off to Albania. Note, all towns except Tirana and a few coastal towns are off the tourist list and you do not want to venture here unless you've done your homework first. By American standards, it is dangerous, no ruthless. In many parts of town you will stand out and you will be accosted. Not a place for mom and the family. But the dealers travel up the Dalmatian coast where it is safer and lots of the Croatian seaside resorts have active "back-room" gun trading sessions. Antique business brisk here. Remember, you are a ferry ride away from Bari, Italy, and a 1/2 day car ride to Trieste through a lax border crossing. Nobody asks anybody what they are carrying on the ferry. Incidentally, the Dalmatian coast is beautiful, economical, safe, and the way old Europe really was. They like us, and our $$$ makes us even more attractive.
Incidentally, anybody who tells you that they can pinpoint the place in Europe where rifling, or the rifle originated, like it popped out as woman from Adam's rib, is full of baloney. It was a process of evolution in the area that is now Germany, Czech Republic, Switzerland, Slovakia, southern Poland, Austria, northern Italy and western France, at least. Go study the guns in the museums and private collections there. And, there is no doubt, rifling is a European development. JWHeckert