I am not a Remington authority (or any gun for that matter), but have seen many issues with magazine interchangeability with the various 760, 7600 old, 7600 newer, 7400 magazines at my friend's shop. I think you better find the correct one and pay up.
The rusty bore doesn't concern me much. I am a user not a curator of a museum.
Last edited by sbrmike; 04/08/19. Reason: addition
