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1951 Russian SKS solid Artic Birch stock
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1950 Russian with laminated replacement stock with 2 reinforcement bolts
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Early Receiver
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Early gas tube 45° angled front
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Early bayonet lug both notches are parallel
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Arrow pointing to machine cut that will identify early receiver
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Late bolt
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Early bolt---------------------Late
bolt
Note difference in
firing pin, ejector is different also