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Quick serial number guide:

No serial number, pre 1967 rifles

Serial number range 400-419K 1967 rifle

Serial number range 419-473K 1968 rifle

Serial number range 2.1 million-2.59 million December 1968- January 1977 rifle

Serial number range with an "A" prefix-post Feb 1977 rifle.

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Q: Approximately when was a Remington Nylon 66 with a serial number of 2309580 built?
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