So 40K is built on over the top imagery, and I can accept most of it as just that. But the one thing that totally stops me from suspending my disbelief?
Any time a gun with gatling barrels is on a model without a significant ammunition container.
Seriously, this is the size of a typical assault cannon ammo box:
Compare it to the size needed for a modern gatling gun:
The ammo pack is bigger than the gun! And that backpack would give you exactly five seconds of firepower!
Then compare it to something 40K sized - the avenger cannon off an A-10 tankbuster...
THE AMMO DRUM IS THE SIZE OF A CAR!
AND THAT WOULD LOOK AWESOME ON A TERMINATOR'S BACK!!!
I'm just saying...