High Quality Content by WIKIPEDIA articles! The 16 inch Coastal Defense Gun M1919 was a large artillery piece installed to defend major United States' seaports between 1920 and 1946. The first 16-inch gun was started in 1895 and completed in 1902 by the Watervliet Arsenal. It was eventually mounted on a disappearing carriage in Fort Grant, Panama Canal Zone, where it served until scrapped in 1943.

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