wow, its been 3 years since my last post here. Alright... answer to all your concern of getting a marker. Simple answer : No, you do not need license. Yet there are no laws stated you can own one either.
BUT: safety, and the respect of the game is all under your responsibility. Meaning if you happened to operate your marker at Non paintball area would harm the entire industries.Paintball went through a tough time letting goverment support, more than 10 years just to get recognition, so pls respect it
Second, the rules to keep it and travel back to you home right after the game,disassemble your marker after the game, its nothing cool if u walk in public, with your marker or even fully assemble even in ur car. You will get caught n claim by intentionally misuse of it, then you will be charge. (p/s you never wan to end up in the dark place -police station)

For those who wish to buy new or  second hand marker. Well as mostly you guys might be looking at coolest marker which look like real alike, an advice here: Do not buy online, you will just get your marker lockup in the custom forever. Get to your nearest local proshop, ask them more about detail of responsibility of owning a marker.

Question? I will do my best to answer
My simple setup: [attachmentid=2825354]