[m1903a3]

One last comment, then I shall give up trying to help and/or educate you.

Disc aside, you still have not addressed any of the other problems your stock has. Look in "The Navy Luger" or any of the large number of photos of original Navy stocks in books and on the web. Carefully compare the shape to yours. It's the wrong shape, made out of the wrong wood, with the wrong disc and an attaching iron held on by the wrong screws.