Also, check the serial number on the inside of the right stock panel. If it is off by a few digits, that may be another indication it came from the NYSP. The armorer there didn't care which gun the stocks came off of when he had a bunch of them on his table and then reassembled them. Stocks got switched all the time. Mine has stocks that are 22 digits off.

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Jack
SWCA #2475, SWHF #318