AA gun wont reload

[Fotzkopp]

Okay so I got me a flak and two fast firing AA guns. The flak works fine the AA guns show zero ammo. But when I look into the ammo depot screen it says I still have PB ammo for them. What´s the solution here? Is there a reload button somewhere?
I only have GWX Gold installed.

[FUBAR295]

You need to click on the shell casing for the AA ammunition, once high lighted it should start to load.

Good hunting,
FUBAR295