Concept
A magazine, or simply called mag, is an ammunition storage and feeding device for a repeating firearm, either integral within the gun (internal/fixed magazine) or externally attached (detachable magazine). The magazine functions by holding several cartridges within itself and sequentially pushing each one into a position where it may be readily loaded into the barrel chamber by the firearm's moving action. The detachable magazine is sometimes colloquially referred to as a "clip", although this is technically inaccurate since a clip is actually an accessory device used to help load ammunition into a magazine. Magazines come in many shapes and sizes, from integral tubular magazines on lever-action and pump-action rifles and shotguns, that may hold more than five rounds, to detachable box magazines and drum magazines for automatic rifles and light machine guns, that may hold more than fifty rounds. Various jurisdictions ban what they define as "high-capacity magazines". With the increased use of semi-automatic and automatic firearms, the detachable magazine became increasingly common. Soon after the adoption of the M1911 pistol, the term "magazine" was settled on by the military and firearms experts, though the term "clip" is often used in its place (though only for detachable magazines, never fixed). The defining difference between clips and magazines is the presence of a feed mechanism in a magazine, typically a spring-loaded follower, which a clip lacks. A magazine has four parts as follows: a spring, a spring follower, a body and a base. A clip may be made of one continuous piece of stamped metal and have no moving parts. Examples of clips are moon clips for revolvers; "stripper" clips such as what is used for military 5.56 ammo, in association with a speedloader; or the en bloc clip for M1 Garand rifles, among others. Use of the term "clip" to refer to detachable magazines is a point of strong disagreement.
