More than a barrel can kill you!

I believe the answer is:

gun

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'can kill you' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for gun that I've seen before include "Arm" , "It can be carried by 15 Ac" , "What has barrel" , "Revolver" , "An offensive weapon" .)

I've seen this clue in the Evening Standard.

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