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Fx airguns maintenance

I replace my breach o-rings after every 1000 shots or so.

As for the size and type of o-ring required, you can find that info by going to the FX website and going to their support section. They have diagrams with part numbers and specs shown for various rifles. Here is the link: http://www.fxairguns.com/support/

The .177 cal takes a 4.3mm x 1.5mm Buna Nitrile A70
The .22 cal takes a 5.28mm x 1.78mm Urethane A70
The .25 cal takes a 6.35mm x 1.27mm Buna Nitrile A70
The .30 cal takes a 7.5mm x 1.5mm Buna Nitrile A70

Most of the o-rings used by FX are hard to find in typical o-ring stores. For example, here in the United States, only MD Metrics carries the 6.35mm x 1.27mm o-ring. MD Metrics website is http://mdmetric.com/.