In addition to rocks... Slingshots can hurl ball bearings, lead balls, fragmenting explosive filled metal spheres and yes even machetes. They can also be painted black and and come in assault models. Much too dangerous for the show...
Damn rubber bands break, come back and Smack! upside the face, or over the shoulder. He is dressed for that possibility.
Definitiely a sling shot wars veteran!
Now that will work, no flash suppressor, no 30 round magazine - wait is that a pistol grip I see? It is! I guess we won’t see that at the show.