I recently picked up a savage 720 for about sixty bones at the local flee market. It seemed like a good idea at the moment... Now I'm wanting to swap it over to a rifled slug barrel. Hastings makes a sweet barrel for the Browning Auto-5 That appears (in photos) to match the lay out of the savage. However before I drop 400 bucks on a barrel I need to know for sure if these will interchange. Any body have experience in this area? Thanks ahead of time. Nat Hatfield