A clip and a magazine are often used interchangeably, but military terminology is that a clip feeds a magazine (or the cylinder of a revolver) quickly; a magazine feeds into the weapon itself. A removable magazine is often referred to as a clip even by military sources, however.
http://tvtropes.org/pmwiki/pmwiki.php/YouKeepUsingThatWord/LessPedantic
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Clips are disposable,
- I've heard the Garand story a few times.