I visited the IWM in the UK last year and there was an exhibit proving without doubt (the words on the info panel) that Saddam Hussein had weapons of mass destruction.
Now being somewhat of a sceptic I was wondering what the gun/missile/nuclear bomb makers on this forum would make of a smooth bore steel (highly polished, maybe stainless) length of tube about 10' long with bolt up flanges at each end. It had an internal diameter of about 5' (big cannon ball!!) and a wall thickness of about 6".
I know its possible to align bolted together sections but within the tolerances required for a smooth bore cannon??
Personally I'd seen something very similar in a refinery undergoing a refurb a few years ago, so remain a sceptic.