GunStoreStarterKit.com has an excellent guide that explains the different types of FFLs:
If you’re considering starting a firearms-related business or looking to expand your operations, one of the first steps is obtaining the correct Federal Firearms License (FFL). FFLs are issued by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) and allow individuals and businesses to engage in specific activities related to firearms and ammunition. But not all FFLs are the same—there are different types designed to meet various business models. In this guide, we’ll break down the different FFL types, clarify the difference between an 01 FFL vs. 07 FFL, and explain what a Class 3 FFL is.
