Well i have heard about this happining to tippmanns but im not sure if this is the same or not. I basicly know almost nothing about the Piranha and how it works becuase im a tippmann kinda guy so heres my problem.
As i let my friend barrow the Piranha yesterday and i was using my Tippmann it started to shoot twice or at least sound like it was shooting twice and then shoot one ball out of the barrel but sound like it shooting twice....then the gun would uncock, after switching Co2 tanks and trying many other things even opening the gun up which did me no good becuase i have no clue about the Piranha i noticed nothing of course.
Any help would be helpful! This is just a regular old co2 Piranha non electronic.
the same thing happened to me yesterday idk why though and usually i can figure it out. did you look at the bolt to see if you still have all the bolt orings?
Ya definately oil your gun. My friends 98 did that the other day and we just squirted a ton of oil into it and then it was fine for the rest of the day.
If you're still having troubles, try dropping some oil into your asa and (with the barrel off) dry fire 10-20 times. Sometimes the orings just need some lube. If you're comfortable, you can disassemble it and put 1 or 2 drops on each oring on the bolt, rammer, etc. If you're still experiencing the misfires, turn the velocity down a bit. If that helps, but now it seems you aren't shooting fast enough, you could cut the spring as a last resort.