T-155 Fırtına (Storm) is the Turkish variant of the K9 Thunder 155mm self-propelled howitzer by Samsung Techwin. Though essentially using the main systems of the K9 howitzer, including the South Korean designed 155/52 caliber gun system, majority of the chassis, automatic ammunition feeding mechanism, and the German designed MTU-881 KA 500 diesel engine, the T-155 has considerable differences in its turret design, parts of the chassis, the navigation system, and electronic systems (such as the radio and fire control system) which were developed in Turkey. Unlike the K9, T-155 Fırtına lacks commander's digital panoramic sight. Through the Inertial Navigation System produced by ASELSAN the howitzer is able to determine the coordinates of the targets at 17.5 meters deviation. Fırtına can open