Frank, the APX-A1 ships with an optics-plate cover. The slide is milled for Beretta’s adapter system, but it doesn’t include a plate due to the multitude of red-dot footprints. Instead, Beretta offers mounting plate kits separately for Aimpoint, Burris, Docter, C-More, Leupold, and Trijicon products. So, you would need to buy the correct mounting plate for your optic of choice. Have a great day!

plates to fit the Beretta are available for Aimpoint, Burris, Docter, C-More, Leupold, and Trijicon red dots

Frank, the Beretta has available Plates for The Red Dots listed here (Same for the APX/APX A1 : https://reddotshooters.com/beretta-apx-red-dot-sight/ (I highly recommend the Burris FastFire III w/3MOA Dot) : budsgunshop.com/product_info.php/products_id/723007320/burris+fastfire+iii+w+picatinny+mount+3+moa -- Cheers and stay safe!