The 10.5 cm K gepanzerte Selbstfahrlafette ("10.5 gun on armoured self-propelled mount") was a prototype self-propelled gun used by Nazi Germany during World War II. Although it was originally designed as a Schartenbrecher ("bunker buster") for use against the French Maginot Line defences,[1] following the defeat of France it was evaluated for use as a tank destroyer on the Eastern Front.