I had a leak after about six months from my .25 Panthera 600mm. I've been shooting it at about 86 FPE mostly for PRS type shooting. I looked at doing the warranty repair myself, with parts from FX-USA but didn't have the tool to remove the valve cover plug. The leak was coming from that area of the gun. So, I called FX-USA, got an RMA, and sent it in UPS on 14 September. To my surprise, I received the repaired gun on 27 September! No leak, and works just like it did prior to the leak. My only recommendation is for FX-USA to include some sort of list on what work was done to the gun and what parts were replaced. Other than that, great job! Impressive customer service!