Love the concept of Gauss weaponry, but as with another weapon I saw with a semi-similar design, I REALLY don't think I'd want my trigger finger so close to the muzzle. Call me skittish, but there's nothing about having my hand that close to a metal sliver traveling way too damn fast that sounds wise to me.
I'd still risk it just to shoot this thing and put a hole in the moon.
Bushmaster designed a heavy "target pistol" with a similar balance, called the "arm pistol" - it was banned from competition because it was too easy to use well, and instantly made obsolete all that came before. And we can't have revolutionary weapon technology being used for [i]sports[/i], right?