Epic is adding the Suppressed Assault Rifle to Fortnite’s Battle Royale mode, while vaulting the Drum Gun in the new 5.40 content update.
The update (click the source link below for the full details) also adds Field Agent Rio to Save the World, bug fixes, and more.
[Source: Epic Games]
Source: Game Informer Fortnite 5.40 Update Drops/Adds Guns