Pieper Bayard Model 1912 .22 semi-auto rifle missing parts

This very unusual single shot 22 calibre semi auto is missing the knurled thing that holds in the bolt and the smaller head item at rear has been substituted with a plain screw. Otherwise its all there. The way it is supposed to work is you drop in a cartridge, press side release to close bolt, fire, then the blowback ejects the case. These were designed without an extractor! Parts seem very hard to find (tell me if you know where I could get the missing two parts)?  

The firing pin is present and good and these are usually missing..

The chamber accepts a long case, so it is probably 22 Long. The stock is good but was sanded lightly at some point. 

Bore is excellent. Yes I will remove parts to sell separately, please ask.

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