https://www.gamespot.com/articles/fortnite-season-6-update-vaults-a-bunch-of-weapons/1100-6462101/

Epic kicked off Season 6 of Fortnite this week with the release of the game's 6.0 patch on PS4, Xbox One, PC, Nintendo Switch, and mobile. As expected, the update made some big changes to the battle royale game, introducing a handful of new weapons and locations to the map, on top of the extensive list of cosmetics and rewards that can be unlocked with the Season 6 Battle Pass. However, players may notice that a few popular weapons are no longer available.

As part of the 6.0 update, a handful of weapons have been moved to the "vault." This isn't unusual, as Epic periodically removes items from the game in order to further tweak them or make room for new ones, but this time, the developer has vaulted a larger-than-usual cache of weapons. Specifically, Epic has removed the Impulse Grenade, Suppressed Submachine Gun, Light Machine Gun, Bouncer, and the Remote Explosive.