The “Posse” Model has a small cut-around in the ejector housing that allows the ejector rod-head to pivot slightly to the side. This allows the base pin to be removed, without removing the entire assembly.
Pietta HF9CHS312NM Great Western II9mm Luger 6 Shot, 3.50″ Blued Octagon Barrel & Cylinder, Color Case Hardened Frame, Walnut Grip