I have a leak in my gun, and I found the problem. It's this rubber gasket thing, but it's too thin to be a o-ring.

You can barly see it, but it's there. It's the black thing. That part screws into
this:

What's that little o-ring type thing called?
You can barly see it, but it's there. It's the black thing. That part screws into
this:
What's that little o-ring type thing called?


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