As one who has spent too many hours working on Hunter One Triggers, I'm sort of prejudiced against them! They were "state of the art" 100+years ago. When they work they are fine, however one screw-of which there are several-turned one half a turn can render them hors d' combat. Compared to modern one triggers the Hunter is most charitably described as a "cheap chink knockoff of a cheaper jap watch!" Oscar Gaddy was known to use Stevens 311 single trigger units in many Parkers he restored. Indeed some other more modern single triggers are much more reliable. Hope this helps, my bias is purely my own! Best, DR. BILL