20 inch barrel, I'm thinking carbine/full stock. I think mine has the same barrel band, will have to measure. Either way, the sling swivel screw goes through the barrel band. You'd have to ask Brian for details on the take down.

The Austrians, did not include the rim, so 9.5X56. The Germans do include the rim, so 9.5X57. Two ways of describing the same round.

CIP definitely calls it the 9.5X57. I'm trying to figure out how to post the attachment, I have the CIP pdf kicking around someplace. Here's a link: https://bobp.cip-bobp.org/uploads/tdcc/tab-i/tabical-en-page72.pdf

Neither is to be confused with the 9.5X57R. I actually have 20 pieces of brass for that, but have no idea what I'm going to do with them. Maybe some day I will win the lottery, and have a double made for the rimmed cartridge.