1) What weapons can be fitted to the shoulder mount?
2) When you use the Free action to fire the weapon, can it be a Full Auto Burst or a Semi-Auto Burst?
3) If the weapon fitted to the shoulder mount is a pistol, can it be fired in melee?
4) Is it possible to take the MIU Weapon Interface a second time to mount a weapon on the other shoulder? Could this be used to grant Twin-linked to a pair of weapons so mounted?