The Vollmer M 35 (also known as Vollmer-Maschinenkarabiner or MKb 35) consisted of a series of experimental automatic rifles developed by Heinrich Vollmer in the 1930s. The Vollmer rifles were chambered in an intermediate cartridge that was co-developed with Gustav Genschow and Co. (GECO) starting in 1934, under a Heereswaffenamt contract.