Caliber- dimensions of a bullet.
Round/Cartridge- the bullet, casing, primer, gunpowder, etc (what you load into a firearm).
Clip- usually a metal strip that binds a bunch of cartridges together. These get fed directly into a magazine (internal or external).
Magazine- a container that holds cartridges can be internal or external. When *most* people say “clip” they are referring to a magazine.
Drum- a very big magazine that looks kinda like a drum.
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