The Holosun 507C and 507K are two of the most popular pistol red dots, but they are built for different-sized slides. Here is how they compare and whether they interchange.
| Spec | Holosun 507C | Holosun 507K |
|---|---|---|
| Footprint | Trijicon RMR | Shield RMSc |
| Emitter | Open | Open |
| Reticle | 2 MOA dot / 32 MOA ring | 2 MOA dot / 32 MOA ring |
| Typical price | ~$310 | ~$300 |
Do the Holosun 507C and Holosun 507K use the same footprint?
No — they use different footprints, so they are not interchangeable. The Holosun 507C is cut for the Trijicon RMR footprint and the Holosun 507K for the Shield RMSc — running one on the other’s slide needs a different cut or an adapter plate.
Full compatibility (every optic + pistol) for each footprint: Trijicon RMR · Shield RMSc