Originally Posted by
MarshalAdamar
in the shooting phase I'm pretty sure the rules is that walkers have about a 180 degree arch of fire, but they cannot pivot (I think, no rule book in front of me).
They have a 45-degree arc of fire, but they can pivot before shooting (not after). See page 72:
When firing a walker's weapons, pivot the walker on the spot so that its guns are aimed at the target (assume that all weapons mounted on a walker can swivel 45 degrees, like hull-mounted weapons) and then measure the range from the mounting point of the weapon and along its barrel, as normal for vehicles. This pivoting in the Shooting phase does not count as moving and represents the vastly superior agility of walkers in comparison with other vehicles. Keep in mind however that the walker will probably remain facing in this direction until its next Movement phase, so its facing will determine where its rear armour is going to be when the enemy returns fire!