AFV gun used in Chieftain & Challenger tanks.
It was the first of NATO's 120mm tank guns which became the standard calibre for Western tanks in the later period of the Cold War. The L11 was developed by Britain's Royal Ordnance Factories to equip the Chieftain tank as the successor to the L7 gun used in the Centurion tank. It was also used on the Challenger 1, which replaced the Chieftain in British and Jordanian service. The weapon has been superseded by the L30 series 120 mm rifled tank gun.