Before revision: Built-up construction was the norm for guns mounted aboard 20th century dreadnoughts and contemporary railway guns, coastal artillery, and siege guns through World War II.400px|Diagram illustrating arrangement of components of a built-up gun, in this case the British BL 6-inch Mark IV naval gun of the 1880s .
After revision: Built-up construction was the norm for guns mounted aboard 20th century dreadnoughts and contemporary railway guns, coastal artillery, and siege guns through World War II400px|Diagram illustrating arrangement of components of a built-up gun, in this case the British BL 6-inch Mark IV naval gun of the 1880s .