Still have a good supply of these 6 inch pistol crossbow bolts leftover from an old project. That and a spare 24 inch draw ball shooter. So why not combine the two.
Will modify the crossbow to the classic open rail design, keeping the lines as clean as possible.
Launching these light (6 grams) projectiles from an open rail has proved problematic in the past, but I have a couple of ideas that should hopefully work.