Quote:
Originally Posted by deep thinker
Add a rail if the gun does not have one and use a heavier spear or thinner bands. That should do the trick 
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...or buy a Rabitech!
On the serious side, you can buy a stainless steel shaft (for the source, you should tell me where you live to suggest you a closer on line shop), then pressurize the gun at 25 bar/atm and there you go.
For further improvement, use a more fluid oil (motorbike fork oil will do) and enlarge the side holes of the muzzle for a quicker water output.
Moreover, if you want to spend 100 euro on it, you can upgrade the gun with a "Mamba" kit.