This Instructable shows how to double the shots a Nerf Jolt has, while not adding any extra barells,
Step 1: Gather These Tools and Materials
Knife or scissors, Nerf Jolt, two streamline or elite Nerf Darts, anything required in the Instuctables linked.
Step 2: AR Removal
Search 'Nerf Jolt Air Restrictor Removal' on Instuctables, and follow the instructions there.
[I would do it myself, but I only have one Jolt, and the AR is already gone.]
Step 3: Powerhouse
Search 'nerfrocketeer Nerf Jolt Mod' to follow steps of his rubber band power mod.
Step 4: Half the Man...
cut both darts in half; make sure it is exactly in half and the two darts are identical
Step 5: Loading
Push the first dart down the barrel, then push the other down so that the tip of the second dart is flush with the end of the barell.
Step 6: Firing & Usage
Cock the Jolt and fire. One dart should come out. Repeat the practice and the other dart should come out.
Please comment whether this worked for you