Gardone Val Trompia, in the Brescia Region of Italy, is a city. Located within it are a number of firearms manufacturers trading on the region's centuries-old history as a centre of sword-making. Brescia steel is the counterpart of Toledo in Spain, Solingen in Germany and Sheffield in England. The Italian government national proof house is also located in GvT - where better?
No matter where in Italy a firearm has been made, and not ALL are in GvT, they all have to go there for proofing, as do any imported firearms made by countries that do NOT have official proof houses, like the USA. The USA is not a signaturee to the CIP provisions. At the moment there are fourteen firearms-manufacturing countries that are, and one of the laws - not rules, but laws, written into the national legal system, is that every firearm made outside any of the CIP nations must be subjected to proof in the country in which they are to be sold. These laws are called collectively, The Proof Acts.