Dug in AT gun.

Quick question. Can a dug in AT gun change facing, or is it fixed in place, similar to if it was deployed in a building?

Hi!
I don't find a specific/special rule for dug in guns fire

From the rulebook we can read:
Deployed Guns
A deployed gun or mortar has a 90°arc
of fire to the front. If a target unit is not
within this forward arc then it cannot
be targeted.
For me this means that guns cannot receive an "open fire" order against targets outside their firing arc ant this normally would occur if your gun is on ambush fire and an enemy target move/appears outside the field of fire .
Wishing to fire outside the 90° front, you in your turn can give a manouvre and fire order so to pivot first the gun and then open fire with a - 1 malus

I don't think that the dug in condition is an hamper to this and the cover is not lost because the gun is not really "moving" outside the pit
Of course the rule is generic for a generic dug in gun pit because is impossible to take in account the many possible different shapes and sizes

Cheers
MT