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yes it will fit just fine

Hi Paul and welcome. Yes, this will be a direct mount on the P226 X5 Legion Pistol. Cheers, stay safe and enjoy!

Hi Paul, no sir, not without an adapter. The P226 X5 Legion uses the PRO footprint, the Romeo 3Max uses the C-More footprint. You want the Romeo1Pro https://www.budsgunshop.com/product_info.php/products_id/113463/sig+sauer+electro-optics+romeo1pro+1x+30mm+obj+6+moa+red+dot+black+cr1632+lithium , Stay safe & have a great day!