Craftable big nasty syringe.

[Karakoran]

I would worry that the raw power of that would just lead to injecting 120 units of literally anything harmful as an insta-kill. Shit, that's so much you don't even need to do something harmful, really. Load it with morphine and you'd OD a guy into oblivion. Honestly I can't see it being anything but harmful. Maybe as some sort of traitor weapon it'd be nice since you could kill a stunned guy in no time at all, but otherwise it'd be insane to give to the crew.