Fire Selector Switch The fire selector switch is only available on guns that allow different modes of fire. This switch allows the shooter to change the modes of fire usually between safe, semi-automatic, and fully automatic firing modes.

FN FN is a real-steel arms manufacturer based in Liege, Belguim. They have a stellar reputation for being known to have produced some of the finest weapons ever made. Having purchased the brand name Winchester as well as Browning they are most noted for the Browning high power semi-automatic 9mm pistol and the FNP-90, which are now Airsoft replica guns.

FPS (Feet Per Second - a measure of velocity) In Airsoft, this usually refers to the speed of the BBs during flight. The speed of the BB is measured in feet per second. This measurement is important in order to maintain all airsoft guns at a safe energy output.

Frame Main body of a firearm or replica.

Franchi / Italian Gun Manufacturer This gun manufacturer is owned by the Italian company Beretta, whose gun making roots go as far back as 1526. Franchi is most noted for its various type of shotguns. Its most popular weapons include the military SPAS-12, SPAS-15 and the sporting/type long/recoil action AL/48. Franchi is also renowned for their semi-automatic shot guns.

GBB Acronym for Gas Blow-Back. The gas blow-back firing mechanism is most common to airsoft pistols. The gun is powered by gas which is stored in a reservoir. The expanding gas launches the BB from the gun as well as reloads the gun for its next shot. Most GBB airsoft guns are semi-automatic pistols that have a realistic look and feel.