Firearms and ammunition may not be brought into or out of Sweden without permission. The Swedish Police are responsible for this particular issue.
The word firearm means weapons with which bullets, buckshot, harpoons or other projectiles can be fired with the aid of gunpowder charges, CO2 charges, compressed air or similar firing agents.
Tear gas, pepper spray devices and crossbows are also counted as firearms, as are starting and signalling weapons that are loaded with cartridges. Ammunition means items such as cartridges, projectiles, and blasting caps.
Regulations concerning import are found in the Weapons Act (1996:67) and the Weapons Ordinance (1996:70).
Regulations concerning export are found in the Weapons Ordinance (1996:70), the Military Equipment Act (1992:1330), and the Military Equipment Ordinance(1992:1303).
You can learn more about the import and export regulations in other countries through contacting the respective country's embassy or consulate.