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Hi and welcome. Yes, the SIG Sauer Electro-Optics Romeo1Pro uses the Leupold DeltaPoint Pro footprint. For the DPP (Delta Point Pro) Footprint optics you will use Pin Set #2. Fitment details here (as well as other Red/Green Dot options): -https://freedomgorilla.com/blogs/news/11-best-springfield-echelon-holosun-optics-red-green-dot-sights-how-to-mount?collection#footprint