Magazine (firearms)

A magazine is an ammunition storage and feeding device within or attached to a repeating firearm. Magazines can be removable (detachable) or integral (internal/fixed) to the firearm. The magazine functions by moving the cartridges stored within it into a position where they may be loaded into the barrel chamber by the action of the firearm. The detachable magazine is often colloquially referred to as a clip, although this is technically inaccurate. 

Magazines come in many shapes and sizes, from tubular magazines on lever-action rifles that may hold several rounds, to detachable box and drum magazines for automatic rifles and machine guns that may hold more than one hundred rounds. Various jurisdictions ban what they define as "high-capacity magazines".