The image shows a custom-made Verpine Sniper Rifle with a bipod, made by the U.S. soldier Raymond Ramirez, a fan with a special connection to Karen Traviss and Star Wars. He made a Verpine Sniper Rifle on Karen Traviss's request which she posted on her livejournal.com blog - the entry has, unfortunately, been deleted, but an image of the weapon can be found here: .
Ramirez's blog "Mando'ade and their toys" has been featured on starwars.com, where a smaller image of the Verpine Sniper Rifle with bipod can be found. One of his blog entries goes deep into the weapon's functions, but is non-canon.
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