https://www.pcgamer.com/fortnite-tweaks-slurp-juice-adds-compact-smg-reintroduces-playground-mode/

Fortnite's Playground mode returns on Wednesday—with new team select options that "let you and your squad set up team battles for practice and training." That's according to update v5.10, whose patch notes detail tweaks to its Slurp Juice healing item, and the introduction of the Compact SMG. 

The latter is available in Epic and Legendary variants, uses Light Ammo and deals and 23-24 base damage. The Compact SMG also boasts a 50-round capacity and can be found in floor loot, chests, Supply Drops and Vending Machines. It looks like this: