국방과학연구소
The Leopard 2A6 and its longer L/55 main gun have been exported for use by the Canadian Army, and the Netherlands upgraded part of its original fleet of Leopard 2s with the more powerful armament. The British Army has tested Rheinmetall's longer gun, possibly looking to replace the current L30A1 120 mm L/55 rifled main gun on the Challenger 2. Two Challenger 2s were modified to undergo firing trials. Although South Korean K2 Black Panther is equipped with a CN08 120 mm L/55 main gun and shows similar characteristics as its German counterpart, it is indigenously developed by Agency for Defense Development and Hyundai Wia, a Korea-based powertrain company affiliated with Hyundai Kia Motors Group.