Any single-player FPS sample projects for UE4?

I’m doing a major project on immersion in FPS games, and I really need a single-player, FPS sample project for UE4.

One that could engage a single player for at least 5-10 minutes, and as it’s testing immersion the graphics will hopefully be pretty decent.

I’m audio based so although I know a lot about game audio, I don’t know nearly enough about the engine to create my own or edit the native shooter game to be single player.

Any help would be amazing!