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AR15.COM
10/5/2012 10:18:23 AM EDT
i have a 3rd gen g21sf. the serial number begins with the prefix  "SPS".  i may be blind, but i cannot seem to find that prefix in any of the s.n. lists that i have found.  anyone have the answer? thanks for your help in advance.
10/5/2012 12:22:23 PM EDT
[#1]
stakhaus.com has a reasonably updated serial number list. According to that site, these are the ones closest to SPS:

"SPN***G-21 GEN 4.02012-03-21
SPR4**G-26 GEN 4.02012-04-28
SPX***G-22 GEN 4.02012-02-09Blue Label with fixed sights"
10/6/2012 4:26:09 AM EDT
[#2]
I'm curious as to what you need help with. The online lists aren't a comprehensive list of all firearms produced by Glock, they're lists of serial numbers reported by Glock owners, along with additional info such as the test fire date. If you want to see your SN on the list, add it. If you just want to know approximate data of production, bracketing the SN range like voyager4520 did will give you that info.