Epic has announced that several pickaxes cannot be used in Fortnite Competitive, though it hasn't explained why. If you load into a competitive match with one
Fortnite’s 15.40 patch is out now. The servers are back online and people can once again jump back into their matches, but what has changed? Epic don’t tend to do official patch notes, relying on the Community Trello to keep everyone up to date with what is going on in the game.
You can find the official notes from there below, but one major change that is not mentioned is that the Flint-Knock Pistol has been unvaulted, and is now available in your matches again. Air Royale: Duos and Knockout Shuffle Trios have also been enabled in the game.