The Tool Gun is an important tool in Garry's Mod. It allows players to manipulate a variety of functions to create different things. The gun itself looks like a revolver with lots of technical wiring and a screen on the back, displaying the tool being used. Also, items in the GUI menu can be spawned using this.
The Tool Gun screen's texture, 100% scale
The usage in the old gmod versions
The viewmodel with hev hands in old versions
The tool gun world model
The Tool Gun uses the sounds of the pulse cannon from the Airboat in Half Life 2.
If looked at closely, you can see random text written on the LCD screen, like "You have not crashed! Click here to crash!"
The Tool Gun is modeled after a Colt Single Action Army revolver, but with several computer components attached.
The Tool Gun uses the same viewmodel animations as the Revolver.
The Tool Gun appears to be running Microsoft Pocket PC 2002 as the operating system.
Also, at the top of the screen of the Tool Gun it shows " < Back to Counter-Strike " and " Team Fortress 2 > "