Do you suppose any of the barrel manufacturers out there would comply with a customer request for a threaded barrel with 3/4"-16 thread pitch at the end of it, rather than the conventional 1/2"-28 thread pitch?
And if a customer could get such a threading on their barrel, at what point is the obligatory $200 tax applied? When the barrel has the threads cut? Or when the oil filter comes off Fram's assembly line? Or when the barrel is mounted to the firearm? Or when the filter is screwed onto the end of it?
http://www.youtube.com/watch?v=7t_pcWPdSDsETA:
Charby has requested that I append the following to my OP.
What is a "silencer" if barrels come threaded and an oil filter has threads? Same thought tangent as a RepRap 3D printer: Silencers are obscure since the purchasing process is obscure. If threaded baffled tubes exist, and threads on barrels exist, the only thing stopping a non "silencer" from being a silencer is the thread pattern. If the thread pattern on a barrel matches a non-silencer device, and threads by themselves are not a silencer, what is a silencer?
It parallels to the same place in my mind, for the RepRap. The imposition against freedom and backdoor registration of the 4473 is completely destroyed by the revolution of 3D printing, once material strength issues are resolved. What is a "gun" when 3D printing is reality? Is it the STL file? Is it the unformed spool of plastic filament marked with a special die to indicate you paid your excise tax, as is done with fuel currently? Is it a "special" license for my CAD software different from non-gun CAD software? Is it the combination of MY computer, MY 3D printer, and MY software? Or does the "gun" belong to whomever authored the STL file, and if so, what is the chain of ownership of GPL'ed STL files? Who "manufactures" a firearm when the print command is issued? What if the print command is issued remotely via remote desktop or ssh protocols?
It's the same question: When the rules have no answer, where does freedom lie?