WWI Lewis Machine Gun Barrel Specs

Harley-
Don't know if you can help, but I need specs on the Lewis Macine Gun Barrel. I'm specifically looking for the following specs:
- Threaded Barrel Boss on Outer End of Barrel: Length of boss and thread count
- Minimum diameter of taper at outer end
- Location of Gas Port on Barrel

Additionally, do you know of a disassembled barrel anywhere in the SE US?
Thanks-
Rich Lucibella
 
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