It's covered under the National Firearms Act of 1934. Essentially, it's illegal to do without an NFA tax stamp, as what you're essentially doing is creating something which falls into the category of Short Barreled Rifle.
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In the case of firearms made since 1898, MOST handguns may not have a shoulder stock unless they are registered with the Federal BATFE as a Short Barreled Rifle. This is a similar process to registering a machinegun, and requires a one time $200 tax. There ARE exceptions in the regulations for a very few handguns equipped with an original shoulder stock- IIRC, certain Lugers, certain Broomhandle Masers, and certain Browning Hi-Power pistols are exempted by name. However, simply deciding to add a shoulder stock to a Glock or .44 magnum revolver requires some legal action first. Failure to do so carries penalties of prison, fines, and losing right to ever own ANY firearm. If you think you may have an exception, please verify with the firearms Technical Branch of the BATFE, Martinsburg WV.
Federal Firearms License
ATF stands for Alcohol Tobacco and Firearms. Bureau of Alcohol Tobacco and Firearms: the law enforcement and tax collection agency of the Treasury Department that enforces federal laws concerning alcohol and tobacco products and firearms and explosives and arson. founded in 1972, it is one of the agencies of the Department of the Treasury. It is responsible for administering and enforcing federal laws on firearms and explosives; as well as laws dealing with the production, use, and distribution of alcohol and tobacco he Bureau of Alcohol, Tobacco, Firearms and Explosives (abbreviated ATF) is a federal law enforcement organization within the United States Department of Justice. .
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.
No. Aside from the federal law which states that a felon may not have access to, be in possession of, or purchase firearms, anyone who handles firearms in that shop must be covered under the shop's Federal Firearms Licence - any employees who are included under that licence may not handle firearms in that shop. No convicted felon is going to be approved for that.
The Bureau of Alcohol, Tobacco, Firearms and Explosives web site has the information that you are looking for.
Federal Firearms License.
You have to be 21 to get a Federal Firearms License in ANY US state, territory, or protectorate.
Yes, black powder guns are considered firearms under federal law.
The usual meaning is "Alcohol, Tobacco and Firearms," which is a common abbreviation for the federal law enforcement agency, the Bureau of Alcohol, Tobacco, Firearms and Explosives.
The BATFE website has the information you seek.
A felon may not purchase, possess, or have access to firearms ANYWHERE in the US as per federal law.
You can find information concerning the states and their relationship with the federal government in Article IV of the U.S. Constitution.