Muzzle Flash: https://unity3dcollegedownloads.blob.core.windows.net/vrgames/Muzzleflash.unitypackage
Gun SFX: https://www.assetstore.unity3d.com/en/#!/content/66100
Morgue Room: https://www.assetstore.unity3d.com/en/#!/content/65817
Shotgun: https://www.assetstore.unity3d.com/en/#!/content/26685
HTC Vive: http://amzn.to/2hmFwUf