The "Maus" tank was originally designed to weigh approximately 100 ton and be armed with a 128 mm main gun and a 75 mm co-axial secondary gun. Additional armament options were studied including various versions of 128 mm, 150 mm, and 170 mm guns. In January 1943 Hitler himself insisted that the armament be a 128 mm main gun with a coaxial 75 mm gun. The 128 mm PaK 44 anti-tank field artillery piece of 1943 that Krupp adapted for arming the "Maus" as the "Kampfwagenkanone (KwK) 44" retained, in parallel to the Porsche project, its original anti-tank "Panzerabwehrkanone" family designation of PaK 44 when mounted in the casemate-style Jagdtiger tank destroyer.