There is no such thing that I know of. Those threads were milled, not tapped. A tool to clean up a receiver could be made on the lathe.
Did someone weld up a hole without a backer? A stub of old barrel can be made into tap enough to clean it up by milling a cutting edge, chip clearance and case hardening.
Back in my GS school days, 1917 barrels were .50 cents each. We learned all sorts of things on one barrel.
Did someone weld up a hole without a backer? A stub of old barrel can be made into tap enough to clean it up by milling a cutting edge, chip clearance and case hardening.
Back in my GS school days, 1917 barrels were .50 cents each. We learned all sorts of things on one barrel.
