The Phoenix Arms HP22A is a small, inexpensive semi-automatic pocket pistol manufactured in Ontario, California, starting in the mid-1990s as an updated "A" variant of the original HP22. Early 1990s: Phoenix Arms launched the original HP22 (chambered in .22 Long Rifle) and HP25 (.25 ACP) models in the mid-1990s, building upon the legacy of Raven Arms designs using injection-molded Zamak (a zinc-aluminum alloy. The "A" Upgrade: The introduction of the HP22A added functional improvements over the base HP22 model, most notably the inclusion of a half-cock hammer notch and updated internal mechanics.