I noticed that there isn't any advertisements for this, why? Iam getting ready to tear this gun down and rebuild it and the spare kit is now gone. I didn't see it on WWAG, or AOA. Any thoughts.
For O-rings, you can't go wrong with McMaster-Car (http://www.mcmaster.com/#o-rings/=wm2l7s). They will ship via USPS if you specify them when placing an order. I can't help you with the sizes and types of O-rings the Cricket uses so perhaps someone reading this can chime in?
Ernest sells a whole kit with a bunch of each kind the gun needs. Name is Ernest Rowe he tunes crickets and Edgun bull pups. More info on talon tunes forum
A simple web search using "cricket o rings" will provide you with all the information you need. I'm going to PM you with some information that should help you with your tear down.