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The footprint is the Docter/Burris FastFire/Vortex mounting footprint you'll need a mounting plate This one here https://chpws.com/product/fn-509t-vvnm Unless yours came with a Vortex optics plate then you can use that one. Similar model of this optic that mounts to an RMR footprint (much more common plate and some fns will mount an rmr with no plate needed) https://www.opticsplanet.com/truglo-red-dot-micro-tru-tec-3-moa-dot-picatinny-pistol-blk.html

Rodrigo, you will need the plate and insert to mount : https://www.midwestgunworks.com/page/mgwi/prod/66-100154-1 ------------- https://www.midwestgunworks.com/page/mgwi/prod/66-100150-1