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Hi Luther and welcome. G20FS = Glock Model 20 Short Frame 10mm. The additional OS is a Buds entry that is likely a mistake since only Buds shows this in their listing and no other vendor or Glock. Cheers and stay safe!

Hi Luther, according to Glock, OS stands for 'Over Stock'. Overrun from export or another contract, new in box. There are other vendors who also show OS in the listing. See this thread >>> glocktalk.com/threads/anyone-knows-what-the-os-stands-for-in-glock-20-gen4-10mm-15rd-austrian-o-s.1970564/ Stay safe & have a great day!