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Seems that I'm having to stretch out my pistons O-Ring every 3 months as the FPS drops from 330 down to 250
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https://airlab.parts/collections/gearbox-parts/products/airlab-piston-head-o-ring?variant=739258679 It's more about the material than the brand. Just a good, correctly sized Viton one should be fine. Worth also thinking about why it's stretching - is your lube degrading the rubber for example?