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Thanks for answer me!
In spanish speaking we don't have this high level guides.
The shotgun is one of the most dangerous weapon for your ally.
An option to negate this is to hold your friend who hold the shotgun. He still can fire and can't touch you. And the best is that you don't have any recoil using the shotgun this way.
Jetpack + shotgun hold by the other become one of the best combo in coop game (but ok one of the player is just here to fire and almost don't do anything else).
We have not try this with the plasma canon, but if the recoil is also absent, it could be pretty stupid.