So in my game with Matt yesterday this question came up about what happens when a sniper hits a weapon squad like an MMG. I knew that guns could be taken out but thought it was only from hits with "heavy weapons" but when looking it up, thats not the case.
So the relevant rules are:
Pg 58: Exceptional Damage
Pg 73: Team Weapon - Support Team Weapons
Pg 91: Sniper
Pg 96: Damage on Artillery Units
Essentially it looks like one kill from a sniper on any non-artillery (so excluding howitzers, mortars, and anti-tank guns) team weapon will kill the whole team. The same for any Exceptional Damage roll, sure but its particularly relevant for Snipers since they always score Exceptional Damage. Plus the whole hit on 3+ unless pinned thing.
The rules basically say the gun itself is destroyed or the remaining crew are spooked and leg it. In our game for instance, the flamethrower's assistant would have also been destroyed when the flame thrower model was. And if I'd hit the MMG even once, and you failed that save, the team would be destroyed.
Food for thought when list building I guess.