The Bureau of Alcohol, Tobacco, Firearms and Explosives web site has the information that you are looking for.
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Federal Firearms License
Federal Firearms License.
You have to be 21 to get a Federal Firearms License in ANY US state, territory, or protectorate.
In the US, you apply for a business license and apply to the Bureau of Alcohol, Tobacco, Firearms and Explosives for an 01 Federal Firearms License (Dealer's license).
The letters FFL stand for a Federal Firearms License. This is a license that enables an individual or a company to legally manufacture firearms or ammunition.
The BATFE website has the information you seek.
In most cases, no. However, a theft from an interstate shipment of firearms, or theft from a Federal Firearms License holder (dealer or manufacturer) IS a Federal offense.
The BATFE has all the requirments on their web site.
The sale of firearms is governed by both State and Federal laws. To be "engaged in the business" of buying and selling guns anywhere in the US, you must be licensed by the Federal Government as a Federal Firearms License holder with an 01 Dealers license. All gun shops and sporting goods stores that sell firearms hold such a license.
You will have to contact the BATFE to fnd out.
There is a Class II, and a Type 2 FFL. A Type 2 Federal Firearms License is a dealer in ordinary firearms that operates as a pawnshop. A Class II (roman numberal 2) is a manufacturer of National Firearm Act weapons (such as machine guns)