The sound comes from the effects set for Metal Slug 6, Metal Slug 7 and Metal Slug 3D, entries in SNK's long-running run-and-gun arcade series. Metal Slug is known for detailed sprite combat, heavy weapons and non-stop enemy waves, and its gunfire effects were widely ripped and shared in game sound packs online. This dual firing burst reflects that arcade style, with layered shots designed to be heard clearly over explosions and music. Editors still reuse it for gameplay videos and meme battles where authentic retro shooter energy matters.