I have an intermittent leakage problem that I haven't been able to identify. It may be fine after sitting for a week or it may drop 50 bar, after refilling it may maintain or it may not seal, shooting occasionally doesn't seem to change anything. The gun is in stable temperature conditions and multiple bubble tests have not shown a culprit. From various comments in the past I am suspicious of the regulator seals and ordered a complete oring kit from a vendor on Amazon, this vendor also sells on Ebay. Turns out no orings are included for the regulator, looking closely at the official FX part drawing the seals are not called out seperately. Also in the fine print on the ad it turns out the orings are for an FX Regal 400 and I have no idea if they are the same, out of disgust I look at a competing vendors ad that says they are an exact replacement - until you look at the fine print at the bottom that says they may be slightly different size and hardness and material! I called AOA where the gun was bought and was told to buy parts from the new FX place that wouldn't answer the phone or return the call, I have read good reports on Utah Airguns and was advised by them to take the regulator to a local hardware store where they could help me. Yeah right! I have nothing against paying some premium price to FX but they have to answer the phone or return the call after some number of calls/days, maybe the bad weather on the coast is making it impossible for Earnest to fly down to the store this week but whatever the cause the lack of being able to buy nickle cost orings for a $1300.00 gun is unacceptable. Doesn't Frederick understand how much ill will this kind of service generates toward FX?