The Orange County Register had a little blurb today about gun control laws around the world and mentioned that they are "strict" in Switzerland.
However, the newspaper did go on to point out that basically every man in Switzerland keeps agun at home for the universal and mandatory military service that exists in that country. Furthermore, it seems in order to buy a personal weapon in Switzerland, one has to provide "good reason" for it. Reasons that are acceptable include recreational purposes, hunting, and self-defense.
From this, I garner that if you are buying a firearm in the land of cuckoo clocks and chocolate, telling them that you are taking up serial killing, going into organized crime, or planning a little drug trafficking are not good reasons to cite.