The general shape fits - Evolution Gun Works HD Picatinny Scope Mount, Springfield

Good quality material, general shape was correct, had to have a gunsmith install it because the rear dovetail was too tight to get on the rear sight. Since these rifles don’t have standard scope mounts and likely someone along the last 80years tapped it for an older scope mount, don’t expect it to be plug and play. The steel on the a3o3 is super hard and my gunsmith wanted to charge a lot to alter the tapped holes. Make sure you measure twice before ordering.