Luke, I have always believed that the large flange Navy Lugers were designed this way to serve the same purpose as the Mauser Bump on the upper receiver... to keep the axle from slipping out when in the most extreme position.
I came to this conclusion based on examination of the design engineering and not from any published data...
just my $0.02
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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