Can someone tell me what gun this is?

[Bodhran]

Saw this guy's screen shot while looking at "Lost and Found" on wowhead and I really dig the gun and was wondering if any of the other hunter's know what it might be or a easy way to dig through all the guns to find it.

http://www.wowhead.com/item=86124#screenshots:id=340828

Thx in advance!

[Vephriel]

That's the handsome Wolfslayer Sniper Rifle!
http://www.wowhead.com/item=28581
One of my favourites, though it can be a pain to farm for in Kara since you have double the RNG to deal with (drop rate + actually getting the right opera event).

[Bodhran]

Oh wow cool ty soooooooo much and yeah the RNG Gods/Goddesses don't tend to like me much but that is a easy enough farm.

[Eternallylostx]

For all you're wolf slaying needs!

[Wain]

Also, if you get the awesome Mogit add-on:
http://www.curse.com/addons/wow/mogit

You'll be able to sort through all (in-game) weapon appearances very easily, and find out what items use them