18 USC § 922(k), (o) & (v); 26 USC § 5861. Punishable by up to 5 or 10 years imprisonment, depending upon specific violation.
A. Any machine gun, fully automatic firearm or any part designed or intended exclusively for use in such weapon;
B. Any firearm silencer, including any device, or part thereof, designed to silence, muffle or diminish the report of a firearm;
C. Sawed-off shotgun with a barrel length of less than 18" or overall length less than 26";
D. Sawed-off rifle with a barrel length of less than 16" or overall length less than 26";
E. Destructive device; F. Semi-automatic assault weapon manufactured after October 1, 1993; OR
G. Any firearm which lacks a serial number or contains an altered or obliterated serial number.