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AFAIK, the letter indicated special features. The 8A was standard with a straight stock, the 8C had a pistol grip and high grade stock, etc. The grades were in the catalog but were not marked on the rifle.
The 81 differed from the 8 by having an additional firing pin spring to eliminate the possibility of firing out of battery due to firing pin creep.
Some writers say that the 8 and 81 have a detachable magzine, but I have never seen one in a standard rifle. I believe that may have been a special order for police or an after-market conversion.
Jim
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