If you load the wolf slayer into the model viewer with stun, it seems the character is holding pistol style the the stock is just inside the model arm. If you line up the rifle right the sight is almost gone and the design stands out.

I thought this was a engineering or rep rifle that is inside model viewer for WOTLK, but never was used. They had a lot of ranged for that xpac for some reason. Mammoth something no doubt.

http://www.wowhead.com/item=28581#modelviewer:22+1