I just wanted to share this...
I made the mistake of buying Clone/Knock off Glock Lower parts kit on Ebay. The listing stated they were Original Glock OEM Parts from Glock I was purchasing and they were NOT.
Now there was nothing wrong with the lower parts kit I got and its obvious Original Glock OEM parts are really hard to find right now.
I found this posting on MarineGunBuilder.com
Site discussing the differences and what to look for to see if you have Legit Glock OEM parts you purchased thru Ebay.
the link is below you might have to signup for the forum to view (Sorry not my site, but worth the signup in my opinion)
MarineGunBuilder.com - Glock OEM Parts Vs Knock Offs
Forum | Marine Gun Builder