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Yes, it can be heard and also if you hold the barrel end with your finger you also feel the air is coming out through it.

Hello, I got an older Huben K1, I think 2019 maybe. I had a problem with very slow air leak from under the valve (the brass part on the bottom part of the receiver). Resealing helped, but now the air is leaking through the barrel and I do not know what to do. Any advices what might be...