LOL! Yea, I have a couple of those o-ring assortments from Amazon, out of the thousand you get, only about an 1/8th of them are actual usable on air guns! If you contact FX direct, I would let them know the problem you are expeciencing, maybe they will send you some replacements for free under warranty.
Also, Amazon has a generic Fill Adapter that comes with extra o-rings, just in case you want to have a spare!
https://www.amazon.com/Paintball-Filling-Charging-Adaptor-Hole%EF%BC%88Color/dp/B08SM8FG1S/ref=sr_1_1?crid=2YHLK65HLA8L7&keywords=FX%2BFill%2BAdapter&qid=1648399296&sprefix=fx%2Bfill%2Badapter%2Caps%2C102&sr=8-1&th=1
Also, Amazon has a generic Fill Adapter that comes with extra o-rings, just in case you want to have a spare!
https://www.amazon.com/Paintball-Filling-Charging-Adaptor-Hole%EF%BC%88Color/dp/B08SM8FG1S/ref=sr_1_1?crid=2YHLK65HLA8L7&keywords=FX%2BFill%2BAdapter&qid=1648399296&sprefix=fx%2Bfill%2Badapter%2Caps%2C102&sr=8-1&th=1
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