MP43

The MP43 (Not to be confused with the MP43 AR in real life), is a 12 Gauge Double Barrel Shotgun. It is one of three shotguns in-game and is the only double barrel shotgun in-game. FYI, a double barrel shotgun is a shotgun that shoots 2 slugs in a short succession, one slug coming from each barrel.

Pros
The MP43 can deal a lethal 110 damage if all pellets from both slugs hit, though that is very hard so your best bet is to quickswitch after the secession and finish the low health enemy off with a fast firing weapon.

Cons
This weapon deals very low damage (55 per shot) compared to other shotguns. At the time of when this was written, the M870 probably deals more damage per slug than both of its 2 shots. The MP43 is probably going to be buffed in the future.