My gun is a piranha pro ts g3 mechanical marker that I have had for a few years and now it is double feeding/rapid firing about half the time I pull the trigger. It does this no matter how full the tank is. I replaced the pure energy regulator with a new one once already a while ago because of a leake, should I do it again because I don't know what the problem is

Is this a paint ball gun ?

If it is still giving you problems I would suggest

1. Looking at the ball detent( next to the breach there should be a little cover with 2 screws on it and when you take it off there will be a little knob, generally most of the time double feeding it because it has either broken or been put in wrong)
2. turn up the velocity( if the velocity isn't high enough the marker will not get enough air to recock it)
3. Check to make sure the grip frame is securly tightened to the body( my little brothers MR1 had this problem)
4. If that doesn't work pm me and Ill see what we can do to fix it