At first glance, it's no more impressive than his other guns. It doesn't blink, for example. But a look at what went into the thing, and then at the detail on it, and it'll take you (and/or Commander Shepard's) breath away.
These pics are just a sample; to see the entire gallery, from designs to moulds to completed rifle, check out his site below.
N7 Rifle, Mass Effect 3 [Volpin props]