More info.  The barrel is exactly 22 inches long measured from bolt face to muzzle.  I can't find a "C" on the sight.  There is something that may be a "C" but its too worn to be sure.  I can't seem to get a good picture of it.
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Here is an up close of the sight dovetail. 
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I want to drift the rear sight off and replace it with a Pacific Gun Sight model that uses the cutoff hole and a screw.  I'm having trouble locating one.  Does anyone have one for sale or know where to look?  There is a Redfield hunting sight on eBay.  Are those just as good?  The one I'm looking at doesn't have a screw.  Is that a deal breaker?