Derived from

Error.wav by Autistic Lucario
http://freesound.org/people/Autistic%20Lucario/sounds/142608/
http://creativecommons.org/licenses/by/3.0/

GunSLide.wav by RazzDaSpazz
http://freesound.org/people/RazzDaSpazz/sounds/155174/
http://creativecommons.org/publicdomain/zero/1.0/