I found a Nerf Barricade and a Buzz Bee Tommy Gun at the local op shop for a few dollars and obviously didn’t have the maturity not to buy them.
The reason I liked them is because unlike a lot of nerf guns these use two electric motors to feed counter-rotating flywheels which grip and launch the nerf dart very much like a tennis ball launcher.
The motors are supplied by 3AA batteries, so logical way to make these harmless toys into total liabilities would be to increase the supply voltage. However I am too lazy to make up any specialist battery solutions, and I didn’t want to take away from the stock appearance… so I stuck a DC-DC step up converter into each one as I had them spare from previous projects.
It was simply a matter of cranking these little voltage multipliers up to the max and finding a place to hide them away inside the gun.
Someone had already been inside the Barricade and moved the switch to spin the motors up when the trigger is ever so slightly pressed, they had also for some odd reason added an electrolytic capacitor to the motor supply rail. I squeezed the voltage multiplier inside and added even more hot glue, because excessive amounts of hot glue everywhere are a sign of a quality job.
These things now sound like something from Judge Dredd, are just as lethal, and will definitely maim children, have fun people!