The Vengeful Gladiator's Rifle currently makes the sound of a bow-shot when fired instead of a gun sound.

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Finding treasure since Feb. '05.

http://www.realmhistory.net/arena-statistics/class-breakdown.html

http://www.blizzard.com/wow/screenshot.aspx?ImageIndex=143&Set=64

Thank you for the report, this will be fixed in a future patch.