So far as rarest, the P220 9mm Together with the American button is, IMHO, the rarest. I've various with the ecu release, but have not observed a person in person Using the American button. A version of your SIG P220 handgun made by SIG Sauer having a reversible journal launch, https://sig-p220-price97642.ltfblog.com/26595385/facts-about-sig-sauer-p220-legion-45-acp-holster-revealed