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No it does not, the gun may be used by an unengaged model in BTB but it is always a separate unit. I like the rules governing these things, it means that you can scrap your own quadgun with a well aimed shot if you have lost the position to enemy troops, very very cinematic.

jesse wrote: In the example of the scouts manning the quad gun, does the gun receive a +1 save because of stealth? Basically does the gun "join" the squad?

No. A model in BTB may fire it using the models ballistic skill. It does not join the squad, it is used by it, and the squad can attack the gun.

Edit:
Ninja'd

Rules don't say that it does, only that it is fired with the firers BS and any applicable USR's, like Tank Hunters.