As far as rarest, the P220 9mm with the American button is, IMHO, the rarest. I have many with the European release, but haven't seen a person in person Using the American button. Just after clicking 'Settle for', you'll be shown confirmation on monitor that the contend with thriving.(Video clip https://johnathanhugpd.tribunablog.com/sig-sauer-p220-elite-dark-for-sale-no-further-a-mystery-41188355