You can fire any weapon. Amusingly enough, the following can happen:
- You're on an
ADL with Quad
- A unit deepstrikes near you.
- You intercept them with the Quad-gun during the enemy movement phase.
- Another enemy unit assaults you.
- You overwatch with the quad-gun during the enemy assault phase.
This is because the interceptor rule just prevents shooting in the next turn, not the current one.
this rule is used, the weapon cannot be fired in the next turn,