No illegal smuggling was done. I bought this through Airsoft GI.

One other thing... the teflon on the nozzle disappeared.. and i didnt notice any difference in power. I think this is due to the teflon on the barrel, and outside of the hopup. I think the teflon squeezes the hopup in, thus giving it the proper seal. People who have modded please look into this and help me confirm.

Can a silencer be attached? If yes what kind?

Err... technically still smuggling, you got lucky it seems.

this is not encouraged.....don't try that again as you may find your gun to be taken away by customs.

Ok, i really didnt smuggle this. I am listed as from Canada, but i'm currently out of the country. This is why. That is all.