Yeah, the first one I had ever seen was a co-worker at the range just blowing off ammo out of his new S&W MP-15. "You gotta get one if these! You know you're gonna get one!" Fool didn't even have his rifle sighted in... and I never got one. $300 bought a case of ammo at the time, too.
Still, I hope the lawsuits prevail and their ban ruling gets shoved up their ass. The alpha terror fuckups aren't judicial or legislative, so they aren't supposed to have the power to make or interpret law on their own.