The ADE Universal Micro Red Dot Ring Mount for Rifle Scopes is designed to mount a red dot sight as a secondary sighting system directly onto your rifle scope tube. This setup enables a fast transition between your primary rifle scope and a 1x power red dot optic, ideal for close-range engagements. Compatibility: Doctor Footprint: Works with any red dot with a Doctor footprint, including Vortex Venom/Viper, Burris Fastfire, ADE RD3-006, RD3-009, RD3-012, RD3-013, RD3-015 red dots. RMR Footprint: Compatible with red dots with a RMR footprint, such as Holosun 407c/507c, Holosun EPS Carry, ADE RD3-020, RD3-023, RD3-029. Burris Fastfire C, Shield RMS/RMSc Footprint: Works with red dots using the Burris Fastfire C or Shield RMS/RMSc footprint, including Leupold Deltapoint Pro, Sig Romeo Zero, Hex Wasp, Swampfox Sentinel, ADE RD3-018, RD3-021, RD3-030. Holosun 407k/507k/EPS Carry: Also compatible with Holosun 407k/507k and Holosun EPS Carry red dots. Additional Features: The mount also includes an additional removable 5-slot Picatinny rail, which is interchangeable with the universal red dot mounting base, offering further customization and flexibility for your setup.