Proper noun
Initialism of French Foreign Legion.
Initialism of Federal Firearms License. or Federal Firearms Licensee; a legitimate commercial dealer or manufacturer of firearms, or the license held by such.
Source: en.wiktionary.orgAnd, at said FFL, you have to fill out the firearm transfer paperwork to buy one. Source: Internet
The French Foreign Legion (FFL) was primarily used to protect and expand the French colonial empire during the 19th century. Source: Internet
Hell, one can purchase an 80% complete AR lower without an FFL and finish it with hand tools and a little skill. Source: Internet
Market leader in the FFL Licensing, FFL Kit marketplace. Source: Internet