I don't know much about military hardware, but don't tanks usually have a bigger gun than that?

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I don't know what this unit is...was this ever built?

Hivlt said:

It's a self propelled anti aircraft gun. Intended to shoot down planes, not destroy other tanks.

So it shouldn't be tagged tank then. Gotcha.

Anti air heavy machine guns are typically a job for an armored wagon or APC, right? That thing looks like it's big enough to carry a flak cannon.

The chassis is a Panzer IV (tagged as such on pixiv) but the turret doesn't match any of the Flakpanzer IV variants.

If you think that's overkill for an AA platform, you haven't met the Wirbelwind.

Incidentally, those AA guns are 2 cm Flakvierling 38. So, yes, they are literally carrying Flak cannons.

Edit: If anyone wants to know, it's the Möbelwagen prototype with the aforementioned 2 cm Flakvierling 38 turret. Due to its inferior performance, the second variant used the 3.7 cm Flak 43 L/89 as its main armament.