YouTube mechanic Colin Furze
The video above shows Furze firing the thing at various targets, including a tent, automobile and even his cameraman. Turns out though shooting stuff isn’t the best use of the weapon, as you’ll discover if you watch from the 1:10-mark.
In terms of construction, there’s nothing particularly fancy about the design. It’s essentially two pieces of metal tubing welded together, with a gas canister stuck on top. A toggle switch allows the flow of gas to be turned on and off. A battery in the back makes the whole thing work.
Still, if you’re keen to see the build, check out the clip below.