The Navy Gun Car Mk I line was improved with the arrival of the Mk II which removed the need to erect a support base for firing the gun at higher angles (this was the case with the Mk I). Eight more cars followed in production though these were completed too late to see combat in the war. They did, however, survive throughout the interwar years to see service in World War 2 as coastal defense weapons. They then were either scrapped or preserved as outdoor showpieces.
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