What's amazing about it? Webley was building reliable double action revolvers from 1860. They were solid frame models which had to be reloaded in the same fashion as single action revolvers. By 1876 patents were issued for the Webley Pryse double action revolver which was a top break design which simplified the reloading issue. In tern they quickly developed speedloader arrangements. Which means that while the 'cowboys' were dicking about with single actions, the Brits were using double action revolvers capable of being quickly reloaded.