kuduae,

Thank you!
Exactly the kind of information I was looking for!

I am a very amateur Mauser historian, but I have developed an eye for anomalies. Then I can't help but try to buy them.

Then turn to the real experts to tell me what I bought.

Being the same pattern as the 1903 Turk & 1909 Peruvian, what are the odds it has a small barrel shank?

The last two Oberndorf(commercial) actions I spotted and bought were both 1903 production standard length with small shank barrels.