Well I did Really Big Guns, it's time for little guns!
The Bunny, a Steampunk Garter Pistol - This instructable shows how this tiny gun was made.
this stylish glass and brass raygun by Lawrence Northey.
H.G. Wells Tesla gun by Nerfenstein
The Clockwork Vapouriser by Rubbertoe Replicas -Guns don't get much more gorgeous than this.
This is a lovely and unique gun made from old camera and radio parts. Check out the progress photos here.