[Hectic]

What they said.
Also what are you planing on doing with the thompson?
If you just want a thompson to hang on yer wall then go for it. If you looking to get into playing airsoft the thompson isnt really a good choice. Not alot ofaftermarket parts for it. Most games wont want you runing around with a drum mag. Lotta reasons. Cool gun dont get me wrong just not really a gameable gun IMO.
If your stuck on it then at least go for a regular thompson and build a ww2 kit and get in with that group of players then it wont be outta place and most of the guns will be equal in terms of performance as alot of the ww2 guns dont have huge upgrade support and such.