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FX Help Needed: New Panthera Air Rifle Leaks

Hey everyone,

I'm having a problem with my new 700 mm Panthera air rifle and could use some advice.

Basically, when I removed the air bottle for the first time, all the air pressure from the gun's plenum released through the back air tank port. It's weird because my rifle is still pretty new - I've only shot about 50 rounds.

I wanted to check the barrel for a carbon sleeve, as some folks online said their Pantheras were missing it. So, I started the degassing process by dry-firing, and that's when I noticed the air leak.

I followed a tutorial on YouTube to check the barrel, and I did find the carbon sleeve, but it seemed shorter than it should be.

When I put everything back together, all the air left in the tank leaked from the barrel.

I haven't had a chance to refill the air tank or research the leaks further, but I'm worried because this rifle wasn't cheap.

Has anyone else had this happen? Any ideas on how to fix it?

Thanks for any help you can offer!