The BATFE website will have what you are looking for. To many variables that you don't address to answer here.
Required by ATF to identify who imported the carbine.
ATF agents monitor alcohol, tobacco, and firearms in the US
Bureau of Alcohol, Tobacco, and FIREARMS.
This is the acronym for the Bureau of Alcohol, Tobacco, Firearms, and Explosives.
AlChol Tobacco Firearms
Many times, the answer to these types of questions is "it depends". The reason for this answer is that in general there are always exceptions to rules, even federal rules. U.S. law provides for the importation of firearms. The ATF has promulgated regulations under the Arms Export Control Act, The Gun Control Act, and the National Firearms Act regarding importations. In general, a non-licensee must secure the services of a Federal Firearms Licensee in order to import a firearm form Mexico or any other country from which firearms can be lawfully imported. The ATF Form 6 must be filled out and submitted in accordance with the instructions on the form. Once the form is approved, the firearm may be imported. Be prepared to provide extensive information about the firearm, or the ATF will disapprove the request. Once the ATF Form 6 is approved, you should contact US Customs and ensure that you understand what their requirements are. What happens often is that firearms will get held up by customs because a required document is missing, etc. You will have to pay for storage of that firearm until the issue is resolved. Contact the Treasury Department TTB (Tax and Trade Bureau) regarding possible excise tax requirements.
The Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE), commonly known as the Bureau of Alcohol, Tobacco, and Firearms, or ATF, is a federal law-enforcement agency, as are the FBI, DEA, and others.
The Bureau of Alcohol, Tobacco, and Firearms was founded in 1972.
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. .
Castrol multi-import
That would be the Bureau of Alcohol, Tobacco, Firearms, and Explosives.
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.