What about the little people? Zeon standard-issue SMG.

This was a leftover scan I had lying around...

But it's interesting to know that someone still cares about the stuff the poor little infantry guys are using to make up some sort of history behind them.

Zeon Submachine Gun

This submachine gun utilizes the 9mm parabellum round, a round which is often called a ‘relic of the past’.  It uses a 36-round double stack magazine to form a very compact weapon.

 (TL Notes: From the image we can see that it has a collapsible shoulder stock, and appears to only have safety and full-automatic fire selector settings.) 

 

Source: Another Century's Chronicle, Vol. 1 （上）