[Ataros]

Originally Posted by Untamo

go back to the map screen

I guess before this you have to save plane preset (not only loadout preset).
Try saving it both as default and custom preset.

Or maybe even try to edit user.ini in notepad. This is what I have there

[Aircraft.Bf-110C-7]
  conv _Gun02 Gun.MG17 150 150
  conv _Gun06 Gun.MG15 150 150
  conv _Gun05 Gun.MGFF 150 150
  conv _Gun04 Gun.MGFF 150 150
  conv _Gun03 Gun.MG17 150 150
  conv _Gun00 Gun.MG17 150 150
  conv _Gun01 Gun.MG17 150 150
  belt _Gun02 Gun.MG17 MainBelt 1 2 4 5
  belt _Gun03 Gun.MG17 MainBelt 1 2 4 5
  belt _Gun00 Gun.MG17 MainBelt 1 2 4 5 6
  belt _Gun01 Gun.MG17 MainBelt 1 2 4 5
  beltPreset Default _Gun02 Gun.MG17 MainBelt 1 2 4 5
  beltPreset Default _Gun03 Gun.MG17 MainBelt 1 2 4 5
  beltPreset Default _Gun00 Gun.MG17 MainBelt 1 2 4 5 6
  beltPreset Default _Gun01 Gun.MG17 MainBelt 1 2 4 5
  beltPreset AM _Gun02 Gun.MG17 MainBelt 1 2 4 5
  beltPreset AM _Gun03 Gun.MG17 MainBelt 1 2 4 5
  beltPreset AM _Gun00 Gun.MG17 MainBelt 1 2 4 5 6
  beltPreset AM _Gun01 Gun.MG17 MainBelt 1 2 4 5
  detonator Bomb.SC-250_Type1_J 2 -1 0
  detonatorPreset "Low Level" Bomb.SC-250_Type1_J 2 -1 0
  weapons 1 1 1 1

Originally Posted by Untamo

I have done a mission in FMB to research this.

You can go to Multiplayer >> Server and test the same mission online at your own server. You may need to add a spawnpoint to it.