So what does that make a Mossberg that originally had a long barrel that was cut off and shoulder stock replaced by a pistol grip?
(out of curiosity of course, my boat is at the dock ready to go)
If it was originally made as a longarm, and you convert it to a pistol, then you have a problem.
You better take that boat ride:
As I read this. It appears to me.
You possess the evil DD
26 U.S. Code § 5845 - Definitions
For the purpose of this chapter
(a) Firearm
The term firearm means
(1) a shotgun having a barrel or barrels of less than 18 inches in length;
(2) a weapon made from a shotgun if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 18 inches in length;