This is A series of 3. Not English, but helped me.
. Use Google translate If needed. Like another said, the video can be interpreted without audio.
You can get the schematic at PA under the resources tab (I think that’s what the tab is called). They also sell the o-ring kit at PA.
personally, I needed one other piece of info and called the manufacturer. The person I talked to was great as well both had the schematic up and were able to reference the issue with identified parts.
Good luck. For a new rifle, all my o-rings were hard as plastic and needed cut out and replaced. Easy, once I had them.
 
Are there any videos of a complete tear down of a classic avenge x? Can't seem to find one. I'd like to watch one before I tear into it. Thanks.
What is the issue you are trying to solve? You may not need a full teardown. I'm the senior airgunsmith for Pyramyd Air. I was doing a large bit of the warranty and refurbishing. You are welcome to DM but if we can keep what we're doing in the thread as well that might be helpful to others.