Legally Buy Machine Guns, Silencers, Short Barrels–Understand the NFA
The process is fairly simple if time consuming. As an individual, you must obtain approval from the ATF, obtain a signature from the Chief Law Enforcement Officer (CLEO) who is the county sheriff or city or town chief of police (not necessarily permission), pass an extensive background check to include submitting a photograph and fingerprints, fully register the firearm, receive ATF written permission before moving the firearm across state lines, and pay a tax. The request to transfer ownership of an NFA item is made on an ATF Form 4. (https://www.atf.gov/file/61546/download)
An alternate method of registering an NFA Firearm is as a corporation, trust, or other legal entity. When the paperwork to request transfer of an NFA item is initiated by an officer of a corporation, a signature from local law enforcement is not required, and fingerprint cards and photographs do not need to be submitted with the transfer request. Therefore, an individual who lives in a location where the chief law enforcement officer will not sign a transfer form, for example, can still own an NFA item if he or she owns a corporation or trust. This method has downsides, since it’s the corporation (and not the principal) that owns the firearm. Thus, if the corporation ever dissolves, it must transfer its NFA to the owners. This event would be considered a new transfer and would be subject to a new transfer tax.
https://www.gunsamerica.com/blog/legally-b...

The press for gun control policy has started, led by MSNBC and others at the press briefing today. Best to understand the facts first, starting with how the shooter obtained the weapon used.