>>534184774
>I dig it. Wonder if any of these had stats or concepts for what they'd be like in gameplay.

There's a non-zero chance that this medigun model was likely used as a placeholder for the Quick-Fix before Valve made their own design.
There's also the fact that Valve's "Clinical Trial" set that came out with Über Update has it's syringe gun named Overdose, and the syringe gun from the set that Schwaben Charger comes from also is called Overdose, can't be a coincidence.