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Ah.. I had not even considered this, the square profile is perfect on these. It seems like the explanation to the squared shape of these! Do you happen to know the specifications of the o-rings? I suspect the ones in the air cylinders are supposed to be of 90A hardness. It would be nice to be...

The current ones can be seen in the images I attached to the post, those are all square ones except one on the main valve assembly. Check the last two images attached to see the grease all over the internal action. Is that what is inside this part with further disassembly? Nordic

Update: I have now successfully disassembled the rifle! Loosening the giant flathead screw inside the upper tube to release the main valve assembly was a major pain.. Some things I've noticed is that this one appears to be of an older model than the ones I find video guides of. My rifle has...

I see.. I guess there is something loose or broken inside then perhaps as has been suggested here.

Ok, I will check those things when I disassemble it tomorrow! Thank you, very much appreciated! I will let you know here when I undoubtedly get stuck or run into problems after disassembly.. :) I have found a few exploded view diagrams of the rifle, but none with specifications of the parts...

After some additional time and a miniscule more leakage I tried the adjustment wheel again. It was very stiff, but this time I got it moving about halfway (it was set at absolute lowest setting). I cocked the action and it actually fired air! After the shot I was able to spin the wheel freely...

Perfect, thank you! I will check those things when disassembling! Since you seem used to these, how do I bleed the rifle empty the best way? It seems to have stopped leaking at around 70/80 bar (1000-1100psi). ..my plan was to shoot it empty in case it all didn't leak out, but since that is...

The barrel is clear! Thanks for the headsup, that was the first thing I controlled when I received the rifle! Nordic

Hey! I have recently bought an Eun Jin Sumatra 2500R .22 with unkown function. This will be my first PCP I'll have to disassemble and fix myself, before I've only owned already functioning ones. The check valve was broken, so first thing I did was to get the Best Fittings foster fill upgrade...