As per request, to edit the ammo_storage section, add the following 2 lines to the propertydefinitions.xml (the 2nd line is a fix for the property just above the ammo_storage section):
Code:
<property name="ammo_storage" datatype="collection" />
<property name="clip_size" datatype="int" />
Add it directly below the line:
This allows you to see all 4 ammo types and change the shell it's object id reference and amount of shells. If there are more requests for fixing properties, please drop a line here.
Good luck