The magazine properly opening inside the frame is beveled, but only marginally. I want there was much more of the bevel there, as There is certainly sufficient metallic to allow it. 45 ACP ammo or maybe the P227 and 9mm ammo. You will just have to be very careful. Marking https://gunsandammunation.com/shop/sig-sauer-p220-legion-semi-automatic-pistol/