(This will be included in a next Deca City equipment and weaponry pack)
This is the SPAS-13, manufactured in 2058 by Franchi, which also has made a variation for Deca City, that supports attachements such as suppresors, lasers and Pumpload mags. (This gun actually has no affiliation with the company itself at all and is simply fictional.)
This gun is not supposed to be this detailed, even though it's more detailed than the one i used on my other wallpapers (which was just 4 cubes.).
Contents:
SPAS-13 Shotgun (with toggleable attachements)
and a Deca Buckshot 26 Gauge Ammo box.
When you will import the object file, you will see this (for the shotgun).
More explanation:
Here's just a random wallpaper i made with this for showcasing. I don't care about the posing, face or lighting, it's just showcasing.