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I have a FN 509sc tactical I want to know if it works alone or if you have to have a plate for it — 1 Answer

by Luis Goveo, from PR, United States Asked on May 2, 2024

Name SIG SAUER Romeo1 1x30mm Mini Reflex Sight, 3 MOA Dot (4.2)
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Answered by Ethan, Gear Expert, from IL, United States, on May 02, 2024

The SIG SAUER Romeo1 uses a proprietary footprint. None of the included optic plates would allow you to install this optic. The Romeo 1 Pro, however, uses the Deltapoint Pro footprint and would fit your 509 via the #1 MRD plate included with your pistol. The Romeo 1 Pro can be found linked below:
https://www.opticsplanet.com/sig-sauer-romeo1pro-1x30mm-red-dot-sight.html

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Last updated 2025-11-12 UTC.