The AmmoType field for a weapon specifies which type of ammunition a weapon uses. This is so that you can make, for example, two distinct weapons use the same ammunition. Usually developers make the weapon, ammunition, and ammo type all match up, but this is only for convenience (and/or sanity).

QUOTE (ThoraxAntburner @ Feb 4 2010, 07:17 PM) <{POST_SNAPBACK}>

The log had nothing meaningful to say with regard to graphics.

Then it's most definitely an issue with a resource pointing towards nonexistent graphics/shans/spins.