CAP Dragon Helium

Donk know if yours is a single or double straw:

Single:

Double:

But theres your missing power.
Helium is temporary and expensive.
A valve job is permanent and always at hand ;-)
 
The Cap is already some kind of modded gun for extra power. I would suggest getting an Air Force or Umarex Hammer or maybe AEA Zeus for more power. A tank of welding grade helium (not balloon helium) is probably going to be $200+ for a small tank and not sure how fast you will go through it. WOuld only take 5 of those to add up to a brand new Hammer or Zeus, much less on the used market since I've seen Hammers go for $450 and I bought mine for $550 (shipped) here on the forum.