M870

The Remington M870 is a 12 Gauge Buckshot Shotgun. It is one of 3 shotguns in-game and is the only current buckshot shotgun. This means the M870s slugs have a average spread of pellets, less than the SPAS-12 and very similar to the MP43. This is most likely the most common shotgun as of now.

Pros
This gun is very common and pairs well with most other weapons. You might be able to quickswitch these to make a MP43 type weapon though this probably will be patched. Due to this weapons pellet spread it is easy to aim and you will most likely land some pellets dealing a reasonable amount of damage. If you land most of your pellets it is nice to switch to a SMG or AR and finish the player off. It is one of the guns that doesn't need to be replaced late-game.

Cons
The major con about most shotguns is their lack of range. This applies here too. If you have a higher tier scope you might consider replacing this with a SPAS-12 because of its high range. The major counter to shotguns is range, so use ARs and other ranged weapons.