.25cal Eagle Claw repair defective air tube

I'm having a problem with my Eagle Claw .25cal. The air tube leaks. It was repaired once, and now leaks again. A few other problems occurred and later repaired. Is this rifle worth it. When it works its a good hunting rifle,70yrd. I have had it less then a 1yr. These breakdowns have me concerned about the product quality, luckily its still under warranty. 
 
Not sure what you mean by repaired but I’m going to assume it’s resealing the gun with some orings or possibly the valve. Where is it leaking from? I use soapy water to find most of my leaks then once reassembled wipe down with some silicone oil. If it’s the valve leaking you might need to replace it , I’ve seen a few Korean guns with brittle poppets and they leak from there but it’s usually a tank dump. 
 
I'd be willing to bet that it's leaking from the foster fitting. Not sure if the foster fitting is a one way or there's a check valve backing it up. The check valve on my Sumatra ended up leaking when the rifle wasn't very old. I removed the end cap and cleaned it out and replaced the Oring with one I matched up to one in a HF Oring kit. It's never leaked since. If you fill the rifle to fast you tear up the Oring.