I know i do not visit here often and heck most of you probably don't even know me but i have to say i am embarrassed at the name calling, complete misunderstanding of the federal gun laws, and that this thread had to be pointed out to me by a customer who knows I host the site. I don't care to side with either of you but want to clarify the matter for the members and those that may find this thread using google.
Let me try this without any name calling and with some
authority as a 07/SOT FFL having sold and advised on NFA for years (tho i am no expert this is just pure basics).
It is LEGAL for any citizen of the USA who lives in one of the 3X states that allow suppressors to personally manufacture one after receiving an approved Form 1 from the ATF. This is also true of ALL NFA firearms/items EXCEPT machine guns, including Short Barreled Rifles (SBR), Short Barreled Shotguns (SBS), Destructive Devices (DD), and Any Other Weapons (AOW).
The USC that were quoted do set the penalties for ILLEGAL manufacture of a suppressor but in no way states that personal manufacture of a suppressors is illegal.
Here are a few other USC sections that were not quoted:
USC Title 26 Section 5822
No person shall make a firearm (USC definition of includes suppressor as someone pointed out) unless he has
(a) filed with the Secretary a written application, in duplicate, to make and register the firearm on the form prescribed by the Secretary;
(b) paid any tax payable on the making and such payment is evidenced by the proper stamp affixed to the original application form;
(c) identified the firearm to be made in the application form in such manner as the Secretary may by regulations prescribe;
(d) identified himself in the application form in such manner as the Secretary may by regulations prescribe, except that, if such person is an individual, the identification must include his fingerprints and his photograph; and
(e) obtained the approval of the Secretary to make and register the firearm and the application form shows such approval. Applications shall be denied if the making or possession of the firearm would place the person making the firearm in violation of law.
USC 26 section 5845 defines a manufacture as follows (note the bold section):
The term “manufacturer” means any person who is engaged in the business of manufacturing firearms
I strongly suggest anyone with a real interest in NFA start by reading James Bardwell's NFA FAQ
and then post any questions on a forum dedicated to the NFA hobby such as http://www.subguns.com