Hello, My son has a Umarex Ruger 10/22 that the o-ring on the cylinder that pierces the co2 cartridge has gone bad or over tightened. I reached out to Umarex to find out it is no longer made. Being that the o-ring disappeared as well I'm wondering if anyone has the correct size of it or where I possibly could find one. Umarex was no help. Thank you!
 
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i don't own one of these but there are 2 piecing pins front and in the lets call it a plug that tighten everything together
i am guess there is no seal in the front because the seal in the back is just a urethane Oring being it is green
https://www.pyramydair.com/blog/201...Q9XI-qMS0HmBL_ORzuHJJAn5BvA53fS9p0QZsMUZ449U3
so, if that is true the size Oring is a 113
shop around
https://www.theoringstore.com/store...ct_info&cPath=367_1321_1324&products_id=27507

and you right Umarex is useless

but i could be wrong