Sheared ejector leg
there is a cross pin in the frame below the rail that needs to be drifted out and then the leg should come out unless an adhesive like loctite was used.
the leg should have a notch cut in it to allow the pin to arrest the leg, you can use another pin to push up and get the leg above the rail surface.
Small Arms Restoration, Inc.
" I started with nothing and Still have most of it left thanx to the federal gov't