I'm relatively new to the world of airguns and am looking for resources to educate myself. I own an Air Venturi Avenger in 22cal and understand the basics of running it for performance, ergo adjusting my hammer spring and shot pressure to get a balance of performance both in accuracy and shot count. I want to learn more. Are there any good books on deeper forms of tuning, through springs, changing of components, barrel enhancements... also covering other modifications of airguns. I'm looking to learn all I can about these guns in all forms not just pops. Thanks in advance for any help with this endeavor.