I have an avenger .25 cal pcp. I now have an air leak when it sits overnight. This gun is my favorite rifle of all. But I hear they are notorious for air leaks. My question is where to look first, & if there is any way to keep this from happening? Fly
Sorry to read about your airgun troubles. Owning a PCP means learning to or paying for O-ring replacement. The O-rings withing the Avenger are not the best coming from the factory. Chances are that several of the internal seals have gotten hard, cracked or just plain failed. Captain O-ring has kits available ( https://www.captainoring.com/store/p298/AVAveng1xBlk.html) and these kits are great so long as you can correctly match the kit seals to those within the gun. Doing a quick search on YouTube for your particular gun should render some videos that will walk you through the process of replacing O-rings throughout the rifle. Good luck
Fly