With this adaptor your Jolt can shoot foam discs pretty well.
One side of the barrel is narrower than the other, so disc spins when flying out. This stablizes the disc and makes the tragectory straight and smooth.
I've tested using 32mmx3mm discs from other toys.
Wrap the tube with a piece of tape, then insert into Jolt's barrel. The friction is enough to keep it in place.