I picked up a very nice German target rifle a system AYDT that is very old, proofed with black and then reproofed with Nitro. No AYDT marks on the thing anywhere with what looks like a new bore. I purchased this as a fixer upper knowing the action and bore were good. But the stock is a different story. I plan on using acurglass and bedding it all in to tighten it up as it has shrunk away from the action.
I am enclosing a picture of the action for some help, it is missing 1 screw in the top tang just below the rear sight base. and in a different picture on the web I found the same action with the screw in  place threaded in from the bottom. I have no clue as to just what the screws purpose is or what it is holding. Any members have one of these that know what it is for please let me know.
Thanks
Mike

Mike, since the trigger plate detaches from the action and stock, the wood screw in the top tang is to retain the stock with the action when on the workbench.

David

Joe and David, thank you both. Here in a couple of days I need to sketch with deminsions for the rear sight base ans send my front sight so a new blade can be fitted. With the barrel in as nice condition as it is I think it may burn the barn down on the range. THe butt stock is about plain jane butt ugly, even has a knot in it so after it gets fitted really nice off it goes for duplication. 
Mike

Hi Fred, I think mine was a small shop rifle. I can't get to it right now but I know there is no Haenel makers name on it anywhere. They are still in business in Germany and still making these rifles too. But they wee located in East Germany so we did not hear from them for year's. You can order a brand new one but the price is rather steep, and they sell accessories such as front and rear sights too.
Mike