Mr Laudermilch, Parker called this a bolting system comprised of the bolt and matching bolt plate.
The system is discussed in The Parker Gun catalog circa 1934 ( Skilled Hands catalog) and in The Parker Story.
For my personal experience, I have guns with the pre 1910 bolt system and the post 1910 system . I can see no practical difference, although it is a more interesting design. I do think the 1905 r & r pinned, completely tapered bolt plate was a superior design to the previous lug bite but I personally believe that if the bolt/bite connection is kept lubricated and the lever is held open upon closing and eased closed, the lock is unlikely to ever wear out. There are many pre 1905 Parkers that have had many rounds through them and are still tight and lever centered today.
The pinned bolt plate when replaced must be individually fitted to the gun. This is true for either the fully tapered 1905 or the stepped 1910 versions.
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