Hi David, no this will not fit the APX A1, this is for a weaver style rail. you don't say what size your gun is (full, compact, carry)?
You can use most any optic, as there are optics plates available for each one. You would need to choose the appropriate plate for your specific optic.

Hi David and welcome. No Sir. This is for a Picatinny Railed firearm. The Beretta APX A1 Optics fitment guidelines are here: https://freedomgorilla.com/collections/beretta-apx-a1-full-size-red-green-dot-optics?srsltid=AfmBOoqXoEVdHV_ptmhyQl8TAEUgoXQK-m1e1Jg42pWdra0Mb_UoeGkP -------------------- Cheers and stay safe!