I'm selling my G21SF (Glock rail, non-ambi safety), it is in excellent condition, fired around 200 rounds thru it. I installed a Vickers magazine release and did some stippling which improves the grip but isn't too rough for carry against bare skin. It also has factory Night Sights. It comes with box, paperwork, and (4) 13 round magazines.
I also have a Nick Matthews IWB Holster & OWB Single Mag Pouch for it which can be had for an additional $85.
Asking $535 for the G21SF with 4 Mags FTF in Magnolia, TX
$620 with the Leather
The wear on the slide is not as obvious to the bare eye as it appears in the pic.