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As far as I recall, the first Cooey 64 was out in 1960s. Through several different manufacturers , they remained the same, but some of the modern action parts do not fit the older actions. Many of the older gunsmiths do make these old gun parts.
Even "home smiths" like me can work on 'em also...last "mod" I did was to convert the wire-type ejector to a flat steel style. Used a dollar store handsaw as stock, a dremel and, a drill press (buddy's garage). 1938? 70+ years....