Instructables member mikeasaurus wrote in with his Airsoft Soldering Gun project, which adds the guts of a cordless soldering iron to an airsoft pistol, with the battery held in the clip!

A soldering gun is a pistol-shaped soldering tool, named for their rough appearance to a firearm.
Why settle for an approximation when you can have a real soldering gun?! Bring this little baby to bear on your next PCB. Point, pull, and let the heater rip.

It’s not so far fetched: A steady hand, a careful aim, an unsafe quantities of lead…soldering and firing a gun have an awful lot in common. Making your own is easy, all you need is an air pistol and a hand-held, battery powered soldering iron and you can make your own soldering gun.