If you domicile in Ma, is a threaded barrel legal ? Just asking.
In a word, yes. Threaded barrel is one evil feature. A common handgun lacks the other features, so you're good to go. AWB definition below...
Handguns/Pistols:
(C) a semiautomatic pistol that
has an ability to accept a detachable magazine and
has at least 2 of--
(i) an ammunition magazine that attaches to the pistol outside of the pistol grip;
(ii) a threaded barrel capable of accepting a barrel extender, flash suppressor, forward handgrip, or silencer;
(iii) a shroud that is attached to, or partially or completely encircles, the barrel and that permits the shooter to hold the firearm with the nontrigger hand without being burned;
(iv) a manufactured weight of 50 ounces or more when the pistol is unloaded; and
(v) a semiautomatic version of an automatic firearm; and