The data provided is for all Model 10s. If you read the individual model numbers, note that some are for the standard or tapered barrel (10, 10-2, 10-4, 10-5, 10-7, 10-9 and 10-11). The heavy barrel models were made along with the tapered barrels and these include the 10-1, 10-3, 10-6, 10-8, 10-10, 10-12, and 10-14. Model 10-8 was made from 1977 until 1988. If you want to know the specific year, please provide the serial number. Hope this helps, Steve
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