A Maryland gun store owner is getting death threats over selling guns -- but he's not being attacked by anti-gun activists.

On Tuesday night's "Daily Show," Jon Stewart looked at Andy Raymond's attempt to sell a "smart gun" that syncs with a watch to make sure it's only fired by its lawful owner.

So why do gun owners hate it so much? Check out the clip above... and see if it makes as little sense to you as it does to Stewart.