[Atlas Sneezed]

I believe that the only true silent weapon is a firearm designed with a silencer function as an integral part of the weapon, not as an add on to the end of a barrel.

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Actually, even those must obey the laws of physics, and make some noise.

[dynachrome]

Very little dang noise. An oddity, the silenced 1895 Nagant revolver:

http://www.youtube.com/watch?v=vvF4yurWSc0