After the drum gun here is... the drum shotgun! Recently data mined in the game following the arrival of the v9.30 patch notes.
Warning: the game play visible above is not the game play of the drum shotgun! The leaker simply replaced the tactical shotgun model with the drum pump rifle model to show what it will look like once in game.
The presence of the "drum" probably means that this shotgun will be able to fire many times before it has to be recharged. Plus, it can be fully recharged in a single movement rather than having to reload it a bullet after an other.
On the other hand, it may be less accurate than the other shotguns available or it might do less damage.
Written by Augustin "TheGreatReview" Héliot. Translated from French by Millenium.us.org