Courtesy of Walt; from Harry Howland
"We were getting all our barrels forged, rough drilled and rough turned from Belgium. We were purchasing them from either Samuel Buckley & Co. or from J. Riga & Co. and it was not until two or three years later that we began purchasing those barrels from the Flannery Bolt Co."

The doc has a pic of a Flues with both LLH and SB&Co