Gunnery
Most of these skills have more to do with vehicle fighting

Sanguinius SA-10 launcher
DaiLung Dragon MMI launcher


Depends mostly on your stats and the size
of the object you're trying to hit.

.50 cal machinegun

14mm Godzilla
7.62mm Minigun
5.56mm SAW

30mm chaingun

90mm LBX Autocannon