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At 400 rounds a minute that 10 round clip would be gone kinda fast.
Like a second and a half kinda fast. Considering the fact that you'd only need one shell for a soft infantry target, I don't see how having anything faster than semi-auto would be useful. Shooting off all ten rounds in 1.5 seconds wouldn't give much time to aim, and probably end up wasting more ammo than not. Changing the clip literally every two seconds in this setting would be very inefficient. Did you have a specific reason for making this fully automatic? The only real purpose I could see this serving is laying down a wide spray of fire upon the initial breach. But being caught having to reload after 1.5 seconds would leave the soldier very vulnerable, so they would probably be better off with an automatic rifle anyway.
But one important aspect of the Nepleslian background is the prevalence of the black market. It's not unreasonable to assume that they could get their hands on some of these weapons, albeit at a higher price then what those that this weapon was intended for.
The automatic function on a shotgun is in the event of "I need all of my shells to be sent down range in the shortest amount of time possible." It follows the German decision behind the MG42 to bump it's ROF high in order to hit fast-moving and suddenly-appearing or disappearing targets, something you would find in close quarters fighting.
Again, the MG42 had 50/250 rounds to an end. It was also designed primarily to hit fast, distant targets. I still question the effectiveness of an automatic shotgun. :?
Hummm, there doesn't seem to be any review of the AA-12 being used in combat. Looking at it fire, though, I suppose a 20 round clip would work well enough. I'd be interested to see it with a drum magazine, though. That would definitely keep a soldier giving suppressive fire for a good amount of time.
And the MP40...? Personally I've never liked that thing. Why does everyone seem to reference Nazi tech for their weapons, though?