[supercat]

If the individual who made the weapon did not sell, rent, lend, lease or transport the weapon across state lines, would the be any basis by which the feds could arrest this individual?

Actually, this poses some interesting statutory issues even beyond the constitutional ones. A collection of parts that can be turned into a machine gun in less than eight hours using common machining equipment is legally considered to be a "machine gun". This raises some interesting questions as to when a "machine gun" is considered to be created (epsecially since by that definition a Volvo could be considered a machine gun).

Of course, the BATF doesn't care what's legal or not--just what they mildly dislike or severely dislike.

[2nd_Amendment_Defender]

A collection of parts that can be turned into a machine gun in less than eight hours using common machining equipment is legally considered to be a "machine gun". This raises some interesting questions as to when a "machine gun" is considered to be created (epsecially since by that definition a Volvo could be considered a machine gun).

Under this definition everyone is a murderer. The Bureau of Alcohol Tobacco Firearms are just a bunch of bully thugs.