Eli5: What’s the difference between a mag, clip, drum, round, etc when talking about guns?

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Also what does caliber mean in regards to bullets?

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4 Answers

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Mag – short for magazine, which is just a metal container used to house the bullets before they get fed into the guns receiver to be fired.

Drum – a magazine designed for high capacity, that is typically circular, hence why it’s sometimes called a “drum” mag

Clip – a strip of metal that rounds can be stacked together on, and then loaded into a magazine, either internal or external.

An internal magazine is built into the gun and cannot be removed, meaning it must constantly be reloaded with clips holding the bullets.

External magazines can be removed from the gun entirely and reloaded bullet by bullet

Round – a round is a bullet, including the casing, powder, primer, everything. If you can imagine someone loading rounds into a magazine, that whole long gold-shiny thing is a round.

The word bullet is used interchangeably for both the piece of metal that gets ejected out of the barrel and separated from the casing (the metal piece housing the bullet before it’s fired), as well as the whole round.

Caliber – the dimensions of a round/bullet (9mm, .50 caliber, etc)

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