This site has some good info: http://americancivilwar.com/cwstats.html
The SKS and AK-47 saw their "FIRST" full scale action against US Forces during the Vietnam War; 1961 thru 1973. In Vietnam, SKS's were replaced by the AK-47 by 1969. If the SKS was built prior to...
Check with your state's Department of Natural Resources (or similar state entity).
on google or wikipedia
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