This is a photograph of a 1912 Vickers machine gun used in WW1. The gun is in the museum at Bletchley Park where the enigma code was broken.
Taken using a sigma 70-300 in macro mode.
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Well heck, this is easy. It's a treaded brass plug screwed into something big........................OHHH, it's the something big that i'm supposed to guess at? I may need to get back to you on that--- :) Nice shot... :)