Board Thread:Questions and answers/@comment-30049823-20200128070945/@comment-30049823-20200402184256

Oh sure, I don't have any Koosh stuff, but I've read mentions of them being more-or-less interchangeable with the Nerf Ballistic Balls.

Go for it! Include some measurements too! (If there's retail PVC pipe available that these things fit into, that's always good to know.)  If it's an ongoing homebrew project you're going to document progress on, though, that probably deserves its own thread.