The clip comes from DayZ, the open-world survival game by Bohemia Interactive that began as an Arma 2 mod in 2012 before launching as a standalone title. The BK133 is one of its pump-action shotguns, valued in game for close-range defense against infected and other players. A clean single firing sound was isolated and shared on soundboards, where short game weapon effects are reused outside gameplay. It remains popular because one distinct shotgun blast is easy to recognize, fits in a few seconds, and works for edits, streams and memes without needing a full firefight sequence.