"1974--1977 N200000

1975--1976 N300000"

Eh?

The 'Second Edition' lists:

N190001 thru N430000 production dates from 1975 thru 1977. What am I missing here? My own 28-2 is numbered 2812xx which would suggest a mfg. date sometime in early-to-mid 1976.

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Cert. Armorer: AR-15/10/M16/M4