The Underbarrel in Fortnite is one of the mod categories that drastically improves your weapon's performance in decimating your enemies.

Fortnite introduced weapon mods in Chapter Five, adding a new dimension to the existing weaponry, allowing you to customize your firearms to your needs. One of the challenges in week nine has you dealing damage to enemies while wielding weapons equipped with the Underbarrel mod. If you’re confused about the mod, we’ve got you covered.

Here's everything you need to know about getting weapons with the Underbarrel mod in Fortnite.

To get an Underbarrel mod in Fortnite, you’ll need to visit one of the bunkers on the map, which have Mod Benches that allow you to mod your weapons. These bunkers only open after the storm circle has formed three times in a match, and you can track it by opening your minimap.