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If you are trying to mount a Sig Romeo 1 Pro optic on a FN 509 Tactical, here is the solution. Use the #4 MRD plate. It is the flatest one. Then mount the optic without an insert, directly on the slide. Finish off with the 514 screws. Hope this helps. Before I figured it out, I could not find any info on it so wanted to share it here.

137952
 
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