Your answer is listed on the Springfield website. Scroll down past the first video where you'll see "Optics Ready". In addition to the ones listed, they show a Crimson Trace on the pistol. I have the Shield RMSc on my Hellcat, with 100% co-witness of the stock iron sights, and am very happy with it. Here's the link: https://www.springfield-armory.com/xd-series-handguns/xd-s-mod-2-osp-handguns/
Just surfing around the web and came across the new Bushnell RXC 200 And RXU 200 red dots. Watched several video reviews which were all positive. On sale from Bushnell at $149.99. The RXC is for Compact and the RXU is for Subcompact. At that price, you might want to take a look. It's a direct mount for your pistol. Here's a link: https://www.bushnell.com/red-dots/s...200-ultra-compact-reflex-sight/BU-RXU200.html