Quoted: 26 U.S.C. Sec. 5845 (b) Machinegun – The term “machine gun” means any weapon which shoots, is designed to shoot, or can be readily restored to shoot, automatically more than one shot, without manual reloading, by a single function of the trigger. The term shall also include the frame or receiver of any such weapon, any part designed and intended solely and exclusively, or combination of parts designed and intended, for use in converting a weapon into a machinegun, and any combination of parts from which a machinegun can be assembled if such parts are in the possession or under the control of a person.
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Then there’s also the clarification of that law in the opinion Justice Clarence Thomas gave us in the 1994 Staples v. United States:
As used here, the terms "automatic" and "fully automatic" refer to a weapon that fires repeatedly with a single pull of the trigger.
That is, once its trigger is depressed, the weapon will automatically continue to fire until its trigger is released or the ammunition is exhausted. Such weapons are "machineguns" within the meaning of the Act
Not just that the weapon in question fires automatically.
Oh, and Jivana108, work on your facts there. You don’t need any kind of paperwork to buy M16 parts, there is no federal law requiring anything of the sort. Someone might have a personal or corporate policy, but no federal law.