the FN 30-11 was the cold war belgian sniper rifle, had a FN mauser action, big machine gun barrel and a cut down 10 rounds FN FAL magazine

https://www.collectorsfirearms.com/products/77217-fn-30-11-sniper-308-win-r27442.html

original 20 rounds FAL magazines fit like here

so you see its possible to get them into a mauser. it depends what you get for magazines, everything over 10 rounds is forbidden here since last year but maybe australia is a better place.