l-r: late Chinese, late Russian, early Russian
The four pictures above show the variations that I have found from the various countries and years.
I will explain more in detail below.
The Early Russian firing pin used a spring for assist and is not interchangeable with others.
The Late Russian shows a triangular machined pin with 2 flat sides.
The Early Chinese is common to all other makers not show above.
The Late Chinese Sheet Metal Receiver model shows the least amount of finishing with 1 flat spot.
Note the differences in the Early Russian where the firing pin retainer only retains the firing pin.
The Late Russian, common to all other makers, uses the retainer to also hold extractor in place.
The Russian 1950 is common only to the 1949-1951 Russian SKS's.
The Russian 1955 is common to 1952-1955/6 Russian and all other makers.
Left is an unaltered bolt from late model SKS Right is altered bolt by Ben Murray.
Ben gets your firing pin spring loaded so it's not a free floater. Contact Ben about his modifications.
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Revised: 24 Mar 2013 10:58:55 -0500 .