KSC USP Magazine leaking at Output valve

[KND]

Hi ! Everyone, It's me again. I have a few issue asking for help from everyone.

I have two USP magazine that are function very well but one thing that is annoying me is that the output valve is leaking some gas out, I tried take it out, lub it and it's still leaking. The leaking come from the hole where eject the gas out of the magazine. Now I'm stuck with that and I can't find any solution else. I plan to buy a few new output valve but since there are non retailer in Canada carry them and ship from Hong Kong is somehow that I hate to do especially order from Uncompany and WGC.

So Any suggestion or solution would be appreciate so much ?

Thanks in advance everyone !

Cheers !
KND