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Hi Cliff and welcome. Adapter plate and recommended (RMSc/K-Series) red dot: https://www.budsgunshop.com/product_info.php/products_id/155839/beretta+usa+eus03063+rdo+plate+black+compatible+w+holosun+k+series+fits+beretta+apx+a1+carry ----------------------------------------------- https://www.budsgunshop.com/product_info.php/products_id/712027064/bur+fastfire+c+6+moa+dot

Hi Cliff, you would need this adapter plate >>> https://www.beretta.com/en-us/product/beretta-apx-a1-carry-red-dot-optic-plate-kit--shield-footprint-EUS03062 For this budget red dot https://www.budsgunshop.com/product_info.php/products_id/114767/sig+sauer+electro-optics+romeozero+reflex+sight+3+moa+dot+sor01300 , Stay safe & have a great day!