Editing Vehicle Design Guide (section)

=== Ammo ===
You buy ammo by going to '''Gameplay -> Map -> Somerset ((or the town you're in)) -> Marketplace''' 
Buying ammunition is done from the Ammunition link under the '''Buy/Sell Section''' from the right-side market menu.

You add ammo to your cars from the same place under the '''Load/Unload -> Ammunition''' section in the menu.

You should bring 2 reloads for all your weapons, possibly even more for weapons with 10 or smaller magazines. Dropped weapons usually don't require reloads since mostly they're used at the start of the encounter to get an initial advantage.