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If the o-ring is coming off it means that it is too big/loose for it to properly be seated. You need an o-ring that is tight enough to not get moved out by the slide returning to battery but also big enough to perform an adequate seal.
You can head out to your local princess Auto store and grab a box of o-rings for $20 cad and then a roll of Teflon tape. Use an o-ring that is the same size as the piston diameter and slowly add Teflon tape until it creates an adequate seal. Then add some gbb silicone oil, press down on the o-ring, and add more Teflon tape until the oring makes an adequate seal without it being able to compress due to oil and moisture on the Teflon tape.
The pdi winter gbbp piston head is garbage in general though, notorious for cracking. Better to get a laylax/metal one.
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