but hits with cca 600J energy

Remember that much of the suppressed report is outside the range of a phone's built-in microphone, and compression of the air also somewhat buffers what can be received by a microphone in general. That's why in most videos (that don't re-mix separate audio tracks and that have the mic positioned close to the weapon being fired) you hear an attenuated or "choked" beginning of the report followed by a significantly louder trailing off. The actual report was quite a bit louder. That being said, I have seen other recordings of this and other 9 x 39 weapons and they are indeed unusually quiet, even when accurately recorded. Just not THIS quiet.

Помню этот гель по Дискавери показывали. На коврик из такого геля, с 10 метров, сырое яйцо сбрасывали. Яйцу хоть бы хны.

ну да, на стрельбище надо быть убийственно серьезными, говорить шепотом и строго команды по уставу.

@@mpopenker, Жора зато хмурый стоит.

@@mpopenker Ну да! это как бы стрельбище, а не место для "озорства", девкам ЦЫЦ!!! ..и продолжить стрельбу)))