Grenade Launcher, Variant (5e Equipment)
From D&D Wiki
A grenade launcher is a weapon which fires grenades at long ranges. With a grenade launcher, you can use an action to fire a grenade at a point up to 600 feet away from you. Once you have fired a grenade from a grenade launcher, you must use an action or bonus action to reload it before you can fire it again.
Weight: 7 lb.