In terms of rarest, the P220 9mm with the American button is, IMHO, the rarest. I've numerous with the eu launch, but haven't viewed a person in human being with the American button. The SRT is definitely an improvement that should be normal on all SIG pistols. A double motion https://sig-sauer-p220-for-sale98664.blogsumer.com/26761153/sig-sauer-p220-price-no-further-a-mystery