The Vantage is the same platform as the Quest/Phantom and so on, so there is a 'kit'

http://scopesandammo.com/storefront/...est-1000-p-471

Keep in mind, however, if you install such a kit in a '500' model- it will become a "firearm" under the law. Buying the parts is not an issue, but if you make a "firearm" out of things, then you would have legal restrictions/obligations after that.