>>395128835
As in, the particle system is not looping, it has a single burst, and that burst happens at the start of the particle system's life. That's what a true semi-automatic single particle system gun should be able to be, if you were truly able to refresh a particle system just by disabling and reenabling the game object. I have investigated several different avatars people have made and talked with other people over the years. This is just a problem with the default behavior of Unity and the fact that we cannot use scripts on avatars. 

>>395129098
You're saying the particle systems do actually play the first time though right? They are probably set to not loop, and to only have a burst on startup. Since it is one burst per cycle, and it doesn't loop, then after the burst (loop 1) happens, the particle system stops. And then when you disable the game object, it doesn't actually refresh the particle system, so it stays on the state it was in, which was the end of loop 1. This is unlike sounds which do start over again when you reenable their game objects.