Remington Model 4 & 6. First and last serial number of each Year. First serial number is A4000000. (See References 1) Because Remington repeated letters for several of its model years, you will need to compare this information against the chart. For example, a rifle could have a model year of either 1930 or 1956. However, if you know that Remington began producing this model in 1940, you can determine that the 'made-on' date is 1956.
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 Evaluating History of a Gun
Article by Jim Supica
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