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Re: Positive Cam Rifle
Posted by Dick Hosmer on Monday, 28 March 2011, at 11:59 a.m., in response to Positive Cam Rifle, posted by SKIPH on Monday, 28 March 2011, at 10:54 a.m.
So far, this is only covered in the Frasca and Waite-Ernst books. Poyer omitted ALL of the rare models. I began to write a book to cover the ones that he omitted, but, in mid-project, I decided we should "begin at the beginning" and start with the .58 and .50 arms. This so enlarged the ms that we had to split it. I'm still working (NOT as quickly as I would wish) on what became the second half.
Look at the receiver and block. You will see an extra cut in the former, and an extension on the latter. The thumblatch shaft has a coarse thread which causes the cam to move slightly sideways as it opens. This apparently eliminated, or at least alleviated, a tendency of the cam to "stick". The block is actually stamped "US Model 1888", which is the cause of the asterisk in some replies regarding the common so-called "Model 1888" RRB rifle (which of course is marked 1884!) Note that the firing pin screw (just visible behind the thumblatch) is on the SIDE of the block, rather than underneath. The guns are easy enough to spot, but VERY HARD to find, since only 100 were made.
The cam idea was dropped, but a result of the testing was to decree that the bronze firing pin was to be used for all future production, and repairs. Hope that helps.
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