The RLM went straight to German companies with its plans. The first plan was the LC-6. It was given out on 14 December 1941. It said that the weapon should not be longer than , that it should not be longer than the Kar 98k rifle, fire single shots from a closed bolt, fire fully automatically from an open bolt, take its bullets from a 10 or 20-round magazine and be able to fire rifle grenades. Although the 7.9mm "Kurz" cartridge used by the "Heer" (the main army) (developed for the MP 43 assault rifle) was in service, the "Luftwaffe" decided to use the 7.92 x 57mm Mauser rifle round. This was because it had long range. This caliber was also mentioned in the plans for the design.