Hey Bahamuto, I've done some testing with barrage and found that it doesn't work properly with multibarrelled turrets.
More specifically, Only half of the turrets are used for double barrelled turrets, only 1/3 are used for triple-barreled turrets, etc.
Pretty sure this is being caused by a calculation using the number of projectils fired per minute, when it really should calculate number of turrets fired per minute. Or something like that
Cheers
(From Mufinman840 on the forum)