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AR15.COM
12/5/2009 9:43:31 AM EDT
I ran across an older model 23, the serial number on the barrel and slide (ND3XX) match but there is a different number on the frame (G18XXUS). Make sense?
12/5/2009 10:19:02 AM EDT
[#1]
Indicates that the frame is not original, or has been replaced.

Usually, if Glock replaces a frame for the original owner, the serial numbers will correspond with the slide and barrel. (With an extra number/letter at the end to indicate replacement.)