Why are gun clips called magazines?

Answer 1

Firearms have been made that use either a clip or a magazine.

A magazine is a part of a firearm that is used to store ammo in until the weapon uses it. A clip, also called a stripper clip, is used to load a magazine. Most semi automatic handguns for example come with two magazines, not two clips.

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We use the term magazine from the french word for storehouse. A magazine "stores" ammunition until ready to be used. It is a much older usage than calling a printed paper periodical book a magazine.

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In addition to stripper clips (For SKS, Enfield, etc.), there are also moon clips (Half and full moon) for revolvers and en bloc clips for the M1 Garand, Lee Rifle, etc.