Ok, so I know that as far the as USA is concerned (from TSA.gov) paintball markers are not considered "weapons/firearms" and you can put them in checked luggage. CO2 or compressed air tanks can even go in carry-on as long as you remove the regulator and the tank is visibly open.
However, my question is are these rules for paintball equipment the same internationally? I know in some countries, paintball is not widely popular. Where can I find out more information so I don't run into issues with security agents at the destination airport?