I love the styling of that rifle.

So that is a Greek Steyr / Mannlicher action?

What is the .256 Gibbs Magnum cartridge? How does it differ fro other .256 Cartridges such as the 6.5x54 M-S / 6.5x53R and 6.5x54 Mauser?

Will have a look at the takedown system and link mentioned.