Buy a MAC-10. They are useless, hard to aim, heavy, and unreliable... but damn are they fun to shoot!
The 9mm is far more pleasant than the .45 though, so if you want it in full auto, go 9mm.
But a G3KA4 with an M203 is a major mall ninja weapon (no offense). Plus, your going to need lots of money to pay for the Class III liscense and Destructive Device liscense you need to own these weapons.
I wish I could buy a Cobray CM203 for my Bushmaster but NY sucks and hates me. God knows what damage I could do with a FLARE gun.
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