What's the noun for shotguns? Here's the word you're looking for.
shotgun
(firearms) A gun which fires loads typically consisting of small metal balls, called shot, from a cartridge.
(slang) The front passenger seat in a vehicle, next to the driver; so called because the position of the shotgun-armed guard on a horse-drawn stage-coach, wagon train, or gold transport was next to the driver on a forward-mounted bench seat.
(US, especially Southern US) A one-story dwelling with no hallways or corridors, with the rooms arranged in a straight line.
(American football) A play formation in which the quarterback is a few feet behind the snapper when the ball is hiked, ideally allowing for an easier pass play.
“Increases occurred in shotshell and centerfire rifle cartridge sales, while rimfire ammunition sales sagged.”
“This is their first effort to publish a shotshell reloading manual, and it's a dilly.”
“The application of the new Flightcontrol wad technology is being spread across the Federal shotshell line to include both tactical buckshot and standard lead shot loads.”