The Incog X is compatible with any Red Dot Sight (RDS) capable of being installed on the firearm manufacturer’s slide behind the ejection port (including mounting options using the firearm manufacturer’s adapter plates). They tested dozens of popular RDS models including larger optics like the Trijicon SRO. The Trijicon SRO requires a slight repositioning of the upper flat clip to eliminate minor interference” but works flawlessly after adjustment. The INCOG-X inside the waistband holster for Glock 17/19 configured for a light. Boltaron construction provides form fitting passive retention. Suede exterior adds extra friction for secure IWB wear. Adjustable clip positioning allows for ride-height adjustment.