Thread: what is this?

Attachment 63935
have recently inherited this sxs
have narrowed down that it is 1960-65 Aya with a demiblock barrel and a boxlock action just having trouble narrowing down the model any advice would be great thanks

Some closer pictures will help heaps mate.

no worries will take more when i get home

pictures of the markings under the flats of the barrel too

the picture uploading system on here is rather old so hopefully i managed to get the right ones attached but here they are.

another thing id also like to establish wether todays modern rounds would be ok to use in this was my father in laws unfortunately lost his license and I've managed to track it down for him due to its sentimental value thanks in advance