M133 (FarCry 3)

“The M133 is a pump-action shotgun with a shorter barrel that disperses buckshot in a wider pattern. It excels at clearing out rooms and hits hard close up.”
— in-game handbook

“The M133 is a Russian pump-action shotgun, as opposed to Natasha, who does Russian pump-action down at the docks. The gun was designed for civilian and law enforcement use. These relatively inexpensive shotguns were purchased in bulk by Vaas and his men.”
— Survival Guide