After years of perching my caulk guns on whatever surface was there, I finally got serious about storing them. As pictured below, the device I came up with holds two caulk guns, but you can use the basic design to make one suited for your situation.
All the parts of this station are 3/4 in. thick. The primary piece and its brace are set at about 75°. The primary piece has to be about 1/2 in. longer than a fully extended caulk gun, plus the depth of the indent that allows it to hang without moving from side to side.
I sometimes think about details to add, such as small pads for feet or a removable plastic tray for easy cleaning. But it works fine as it is.
Robert Billard, Duxbury, MA
Edited and Illustrated by Charles Miller
From Fine Homebuilding #244
Very nice. Three ideas . A handle cut-out or attach a handle for carrying. If the base and body are not connected ( for storage purposes?) you would need to install a type of quick connect/disconnect.
If the base and body can be separated you can use a hinge when you connect the face and it's brace (for storage purposes?). Line the bottom with old newspaper to catch any drips if you don't cap the tips.
If the tray at the bottom had water in it and the tube tips were immersed, would that keep the caulk from hardening?