I have two barrel contracts for Sedgley:
Marine Corps (Navy Funded) April thru Aug 1942
Army Feb thru Dec 1944
These dates are payment dates and may vary from production by a month or two.
I have no records of the barrels being sub-contracted. If they were sub-contracted, my records would show the location of manufacture different from the location of government payment.
It is possible the letters were a request for quote, which never occurred.