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Mario, this may shed some light. Took me a minute to get it : https://www.glocktalk.com/threads/glock-date-codes-by-serial-number.1682001/

Mario, Here is the entire breakdown of the Glock model numbers. Not serial numbers but model numbers.---------https://glockcollector.info/ The 7th digit is for 'options'---Options – PI2350202T 0 = Standard 1 = XSS 2 = XMC 3 = XSS, XMC 4 = Steel front only 6 = Screw on TNS 7 = Screw on TNS / XSS M = Maritime Spring cups