videos in AudioSet
A list of about a million ten-second YouTube clips, each labelled with the sounds in it, that Google published in 2017. Labs use it to train and test general audio and music models.
Including Taranaki Airsoft Rangers - Sniper Stalking (Jing Gong BAR 10, Well L96, Well AW338), Airsoft ScopeCam 3.0 - Sniper Camera Prism Rig