Electro-magnetizer gun
From MediaWiki

When he remembers to bring it along on a mission, Slapdash is armed with an electro-magnetizer gun, or electro magnetizer which can drain a target's power source.
Fiction
Marvel The Transformers comics
In both robot and vehicle modes Slapdash was armed with a powerful electro-magnetizer gun, which had the ability to neutralize and drain the power supply of almost any machine its beam hit. He mostly used it on Decepticons... mostly. Slapdash's Transformers Universe profile
Dreamwave Generation One continuity
In robot mode, Slapdash was armed with a rifle that magnetically drained its' target's energy. Slapdash's More than Meets the Eye profile
Toys
The Transformers
- Slapdash (Powermaster, 1988)
- Accessories: Lube Powermaster partner, laser, engine block, spoiler
- The Transformers Slapdash came with a yellow weapon that could be mounted on his car mode or held in robot mode, labelled generically as a laser in his instructions and revealed to be an electro magnetizer in his packaging bio. This toy was sold in Japan as Road King and the electro magnetizer was repurposed as Road King's pin-hole rifle.

