Depends on how much like the W13 Tesla you want it to be... It's supposed to stun/disable a target and screw with short-term memory while you're at it.
It also has a cool-down (recharges over a couple rounds at least- first season, it was more like a one-off per scene, but they've improved them).
That said... it sounds more like a take-out than a maneuver... so direct damage would be best.
I'm tempted to say it might be closest to an IE designed to be usable by anyone... but... statting one of those out on a non-caster's sheet gets a little hinky- after all, who's Lore is it based off of, and how much do you have to pay for it?
IoP might be best, in that case... does direct damage with the following perks and drawbacks:
+Weapon:3, pistol sized (concealable) (I'd be tempted to say more than 3, since it reliably takes out even tough human targets in body armor in a single shot, no contest, but I think the last two perks more than make up for this)
-take-outs can only result in unconciousness
+but also short-term memory wipe (this may be resistable, since pete was not so much affected, while everyone else ever has been)
+comes with a permanent attached aspect 'Charged Up' which can be tagged for free once per scene for +2 damage. Trying to use it before it's recharged means you'll do less damage, but for a FP, you can more or less declare it recharged for a FP (really, you're spending the FP to tag the existing sticky aspect).
+bypasses any armor not specifically designed to stop electricity (fulfills catch as appropriate?)
Thoughts?
Edit: PS- Arty and Claudia definitely have a variable pool of IoPs, with the obligatory drawbacks for using them.