More info on the relief cut into the receiver on Erfurt Lugers as provided by "The Borchardt & Luger Automatic Pistols" Page 715.
"As late as 1916 someone must have had the idea to standardize the receiver for the short and long 08 pistol. Until this date only the receivers meant to be used for the long 08 pistols were made with a relief cut over the front of the receiver ring. An amendment dated November 1916 was made to add the relief cut for all receivers"
Lon
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