Paradox, I saw that add as well and contacted the owner to send some photos of the end of the barrel which he did. Now either the end of that barrel has not been finished or it has been altered as there are no primary extraction cams or locking lug seats in the end of the barrel which according to Kuduae, there should be on post WW2 barrels. The inside of the barrel end looks as if it has been machined by someone after it had been made by the factory, as in, it looks as if the extraction cams have been bored out as the remaining cylinder wall thickness looks to thin to machine cams into.

Matt.