Sights were changed the calibrating type, initially to the No 9 carrier for the No 7 dial sight.
In the 1930s some carriages were converted to the new 4.5 inch (114 mm) BL ordnance to become BL 4.5 inch Gun Mk 1 on Carriage 60 pr Mark IV and IVP, which then started replacing 60 pounder.