Rules - Firing and Fixed Weapons
So in my game today said they could do the following:
Turn x - pivoted and fired their Pak 40 (fixed heavy AT gun) to the right side of the board. Done with an advance order so everything is fine there.
Turn x+1 - I had a tank coming up the board on the left side (outside of the 90 degree firing arc the gun barrel was facing. On a fire order, They swiveled the Pak 40 about 20-30 degrees on the carriage mount (the base didn't move) and then said my tank was now in the 90 degree arc of fire (45 degrees on each side of the barrel)
My understanding was that for fixed weapons, the 90 degree arc was based on where your gun barrel was aimed at the start of the turn, and that the only fixed weapons that can "swivel" are those that get a 360 degree firing arc, like a Bofors or Flakvierling on a rotating platform). Or do AT gun/artillery models that have a little "built-in" rotation allowed that rotation before determining what's then inside their 90-degree firing arc?
So can you swivel an AT gun on a fire order and then determine the firing arc on a fire order as long as the gun can physically swivel without moving the gun carriage? It doesn't make sense to me, because you use the 90-degree firing arc for a medium machine gun on a tripod based on where the barrel is facing even though the machine gun could probably be swiveled on the tripod in theory (if it wasn't glued down).