Maybe this is a better example because it has a guide to what the numbers refer to when changing the actual location of the weapons:

<Weapon>
  <!-- weapon sub-type section. unlimited number of -->
  <Gun>M60C</Gun>
  <!-- weapon sub-type name. must match GunInfo>Gun>Name -->
  <Shell>M60C Bullet</Shell>
  <!-- shell name. must match GunInfo>Shell>Name -->
  <Unlimited>1</Unlimited>
  <!-- unlimited ammo fire. 1-yes, 0-no -->
  <Station name="Nose" params="0,9,0,0,-0.039,0,200" />
  <!-- Station position (x,y,z) meters, angle of incidence, ammo units quantity -->
  <Mode name="AUTO" shotrate="10" setshots="0" sequence="1" />
  <!-- fire mode section. unlimited number of. name= dispayed on HUD in weapon info string. -->
  <Mode name="X3" shotrate="10" setshots="3" sequence="1" />
  <Mode name="SINGL" shotrate="10" setshots="1" sequence="1" />
  <DefaultMode>AUTO</DefaultMode>
  <!-- default fire mode. Any from the list above  -->
</Weapon>

Mark