I personally think that any ac45 Rifles earlier than the d block that's mismatched did not come from the factory that way. I do believe d block Rifles in the late 2000 numbers , and above where the final stock proofs, and unnumbered bolt groups, or carriers was done at the factory, because I don't believe they ever left, and by that time it was very close to the end. The no letter block, a, and b blocks would of left the factory matching, and they would have the final firing proof on the receiver. I'm not sure about the c block as to how many never left the plant. I have a hard time justifying that no letter, a or b blocks would be unfinished at the factory and GIs finished putting them together unmatched. I do believe anything is possible with the d block as this was at the very end ,and things had to be desperate. I do note that others might disagree with me, and that's ok, it's always good to hear other views. I guess the main question is did Walther send ac 45 Rifles from the factory mismatched, I do not believe they did other than accounting for a small percentage of human error other than d block unnumbered parts.