Mounted Turret coming soon to Fortnite
Fortnite's in-game MOTD has been updated to feature a new item: a Mounted Turret. It has the following description:
"Place the Mounted Turret and hop in to apply some suppressive fire! Careful not to overheat."
Based on this, it seems like you'll be able to place the turret on the ground and fire around you. It's possible it will have unlimited ammo, based off of the overheating system.
We'll update you if and when this story changes. Expect it to appear in the next patch for Fortnite.