By order:
The arc of the fire no is here. I think that this is in .sim valours but i don't jet play with this valours. In the dat only there are positions and objects.
Green marked: - firsts 8 bytes are the id of this chunk
seconds 8 bytes are the id of the parent object were this gun will be placed.
Red underline:- degrees respect the plane XY, XZ, YZ
No more for this chunk.
Last green mark, it is inside a label chunk type 8:
- the id of the this chunk and the childrens chunks that are labeled. In this case is the same id that the non-3d chunk.