The reference for the M590 shotgun
The M590 is a shotgun in the mod.
The M590 is a sawn-off shotgun in the mod, based on a Mossberg 590 shotgun. However, it is depicted with a stubbier barrel and magazine, making it suitable for drive-bys on bikes. The M590 is a poor shotgun, with poor range and accuracy, although it has the highest stopping power.