The Schema Inside-the-Waistband holster features a minimalist design for enhanced concealment with a smaller footprint compared to traditional inside-the-waistband holsters. Superior functionality and passive retention provide an exceptional platform for everyday carry for any user. Schema is optic-compatible and will work with Romeo Zero. RMR CC. Shield RMS. Shield RMS-C. Swampfox Sentinal. Hex Wasp. Holosun 407K. Holosun 507K. J-point. Crimson Trace 1550. or similar optics.