Any ideas on gear to go with this gun?...

[Slickrock]

http://www.wowhead.com/item=21800

The worm gun... reminds me of something out of Stargate..

[Vephriel]

Perhaps the Captain's Set
http://www.wowhead.com/transmog-set=243

Or the Green Iron Set
http://www.wowhead.com/transmog-set=1169

[Worba]

That would be a neat gun to build a set around - maybe windrunner shoulders to start with? They're kind of organic looking...

It reminds me of a white vendor gun in same model but with nice copper hues... but which sadly can't be mogged. >:(

[Slickrock]

Hmm.. perhaps this set.

http://www.wowhead.com/transmog-set=267#.

And I can farm it in the same area, rather that AH farm. (We have 2 or 3 people camping our AH on lower transmog gear)