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The Walkabout was going to be the primary unlockable weapon for the Sniper. The Walkabout would have allowed the Sniper to walk at normal speed while sniping, with the downsides being reduced damage and no zooming or charging. It was replaced by the Huntsman because the development team thought it made the Sniper function too similarly to players wielding sniper rifles in the Counter-Strike games.
References
Video
This is a Walkabout example, coded by The GoldenMachineGun's community.