Sorry to spoil your evening, gentlemen, but looks like some of the gunpods are screwed up, again:
1) U5: 2xMk108 gunpod variant - the 30mm's won't fire at all on Bf-109G6 and G6-Late.
2) The right-wing 151/15 gunpod of 109-F4 sure has some extra ammo: not only does it outlast its left-wing twin, but it also has more ammunition than the motor-cannon