According to Phil Strader ( Pistol Trainer; Competitive shooter; Pistol Product Manager for Sig Sauer) The market is ready for a new firearm !!!!!!! https://www.sigsauer.com/p365x-romeozero.html Introducing the P365 X -- A P365 XL lower with a standard P365 slide cut for a Romeo Zero Red Dot Optic, As of now, the slide is only available as the P365 X with the Romeo Zero installed. Just guessing; maybe the the X slide will be available in a year or so (maybe) !!!!!!