12.8cm Flak40 Type 2 German Heavy Anti Aircraft Gun
Developed in 1936 by Rheinmetall-Borsig, the first prototype Flak 40 was tested in late 1937. Its weight was nearly 12 tonnes which made the gun difficult to transport. However, the firing platform was subsequently simplified based on the assumption the gun would be securely bolted to concrete in static positions. The Flak 40 entered service in 1942 being used in Flak Towers to protect Berlin, Hamburg and Vienna. In total, 1,125 were built.