Grenade Launcher, Multiple (5e Equipment)
From D&D Wiki
A multiple grenade launcher, sometimes referred to as a "six-pack" grenade launcher, is a weapon which can hold up to six grenades at once in a large, revolver-style cylinder, and fire grenades at long ranges. With a multiple grenade launcher, you can use the Attack action to fire a grenade at a point up to 600 feet away from you. If you're able to make multiple attacks with the Attack action, this attack replaces one of them. You may fire as many grenades in a single action as you have attacks. Once you have fired all six grenades from a multiple grenade launcher, you must use an action or bonus action to reload it before you can fire it again. You can reload all six grenades as a single action.
Weight: 12 lb.