There have been pictures circulated around the internet of a Glock 17 with with a couple of accessories that Geissele Automatics designed for a specific military unit, one of which was a magwell (SSD was the source of the images I saw). That magwell is now available through ALG Defense, Geissele Automatics’s sister company, and is called the AFM (ALG Flared Magwell). It features a flared opening to make inserted a magazine at speed more forgiving and an exterior ledge that helps redistribute recoil through the user’s lower hand.
You can call ALG Defense or use the worksheet on their site to order.
Nice alternative to getting either having your OEM Glock slide cut or having to buy another slide altogether.