I did not realise that the airsoft pistols go down when shooting until I saw your post here and the Instagram video.

It really looks odd, now that I know, that this is a thing

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Recently I watched a video from the youtube Channel The Action Lab, showing how to make an easy and quick hydrophobic surface.
I tried it out myself and recordet the results with my Chonros 1.4:
https://youtu.be/qAClwAt8LGw