https://www.pcgamer.com/fortnite-clay-pigeon-shooter-locations/

In week three of Fortnite Season 5, you'll need to shoot five clay pigeons at any of the six clay pigeon throwers scattered around the map. For easy sport, we've mapped out the locations for all six throwers, but we can't help you with the shooting bit. Check out the image below for more general locations, and watch the video up top to see exactly where each clay pigeon thrower is located. 

Once you find a clay pigeon thrower, press the use key to toss an impostor bird into the sky. Take aim, shoot, and be sure not to miss. Not missing is key here, really.