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Hello Dakka,

One of the building damage results does '... and destroys an emplaced weapon'.

Under the section titled Battlefield Debris, there is the profile for an Emplaced Weapon (same as artillery), and there is a separate profile for Comm Arrays. If I purchase a Comm Array on a Bastion that suffers this damage result, is the Comm Array destroyed? Strict RAW says No (because a Comm Array isn't an Emplaced Weapon), but I imagine many of my opponents will argue that it should.

I plan to use this fortification in a tournament, so I'm hoping that will give me some talking points if it comes up.

The damage results on the charts only destroy emplaced weapons, in the case of the bastion those are the heavy bolters.
The comms relay isn't an emplaced weapon it's battlefield debris so it's immune, and while we're on the subject if you did have a quad gun or icarus lascannon they too would be immune since they are a gun emplacement which isn't the same as emplaced weapons.

Reference so you can show the rules to opponents:
Building damage – pg.94
Emplaced weapons – pg.96
Battlefield debris – pg.104
Gun emplacement – pg.105

However, if you destroy the building the building does become Impassible, which makes using the Gun Emplacement or Comm Relay rather difficult. IIRC only Jump and Jet units (including Jetbikes) would be able to use those items at that point, as they can end their move in impassible.