Welcome aboard. .30 or 9mm?
Photos are good.
The k is a production suffix, as in once they reached the end of 5 digits with no letter, then came 00001 up thru 5 digits (99999) followed by "a", etc, etc, etc, up to your gun in the "k" block.
Some of the book guys can be more specific, but that is a generic answer.
dju
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