The 15 cm Schiffskanone C/28 in Mörserlafette (SK C/28 in Mrs Laf) was a German heavy gun used in the Second World War. Production of carriages for the 21 cm Mörser 18 and the 17 cm Kanone 18 in Mörserlafette exceeded available barrels in 1941 and eight naval 15 cm SK C/28 coast defense gun barrels were adapted for use on the carriages. They were converted to Heer-standard percussion firing. See the articles of those guns for details on the design of the carriage. For Operation Barbarossa (the invasion of the Soviet Union), it equipped Artillerie-Abteilung 625. Most guns were replaced by 17 cm barrels as they became available. However, for Case Blue (the German summer offensive in southern Russia), one battery of Artillery Battalion (Artillerie-Abteilung) 767 was still equipped with them.