Yes, our (EGW) mounts with the RMR footprint will fit the 507Comp
The Holosun 407K is not compatible with this optic plate. The 407K uses the RMSc/Deltapoint Pro mounting footprint. The correct plate for a Holosun 407K and optic ready VP9 can be found by using the link below:
https://www.opticsplanet.com/evolution-gun-works-leupold-deltapoint-pro-fits-jpoint-redfield-accelerato-ieyck.html
The Evolution Gun Works Trijicon RMR / SRO, Holosun 407c / 507c Adapter Mount for HK VP9 Optics Ready will fit the HK VP9L OR model.
The Evolution Gun Works Trijicon RMR / SRO, Holosun 407c / 507c Adapter Mount for HK VP9 Optics Ready will fit the HK VP9SK OR.
EGW part number 49513 will fit a 507C and a Non-optics ready G22
No, this Evolution Gun Works adapter plate fits the optics ready VP9 and allows the user to fit an optic with an RMR footprint. If your slide already has an RMR cut you can fit any optic with the Trijicon RMR optic footprint.