basically you are screwed
unless you own a preban, that's why you see gun ct shops offering prebans @ 1500+ and out of state sellers offering off list prebans at such high prices
remember--evil feature count-lug, threaded, yadda yadda. ct allows muzzle breaks or just a plain jane crowned barrel. a suppressor is also a flash hider--so forget about welding it on.
i am moving to sc from ct next month. i was down there last week, where i was fondling a tommy gun, ak47 and all the black rifles i could fathom. black rifles @ $500 to whatever. i am having a hankering for the tommy gun.