The MK2 is a lever-action marksman rifle in Call of Duty: Mobile, a mobile first-person shooter built around the wider Call of Duty series. Its distinctive firing sound comes from the game's weapon audio, where the lever cycle and heavy rifle report give it a slower, more deliberate feel than automatic rifles. Players began sharing the short clip on soundboards to recreate that moment in edits, memes, and gameplay videos outside the game. It remains popular because the sound is instantly recognisable to mobile shooter fans and works as a clean, dramatic cue for a precise long-range shot.