Before revision: Conical liners may be removed by water cooling the liner after re-heating the barrel, but cylindrical liners must be bored out.Fairfield (1921) pp.323–326 Monoblock Guns With the obsolescence of very large guns following World War II, metallurgical advances encouraged use of monoblock (one-piece) construction for postwar guns of medium caliber.
After revision: Conical liners may be removed by water cooling the liner after re-heating the barrel, but cylindrical liners must be bored out.Fairfield (1921) pp.323–326 Monoblock guns With the obsolescence of very large guns following World War II, metallurgical advances encouraged use of monoblock (one-piece) construction for postwar guns of medium caliber.