Here's the 1981 letter "allowing" repro stocks for Lugers and Hi-Powers -
http://www.titleii.com/bardwell/atf_letter58.txt
Here's a 1999 letter seemingly disallowing repro stocks, but only as applied to Canadian Inglis No. 1 Chinese contract and Browning Hi Power 9mm pistols with a "CH" prefix serial -
http://www.titleii.com/bardwell/atf_letter70.txt.
No mention of Lugers or Broomhandles.
I haven't been able to find anything newer. Sorry, don't mean to raise a ruckus, but the admin at The Firing Line raising the question is someone who has credibility on legal matters.