In mid 1974, several fully operational "Prototype 1" G11s were presented to the Bundeswehr. On June 14, 1974, the German defence ministry charged the FODTP with initiating the development of the weapon. The proof of performance was held on December 18 and 19, 1974. The achieved firing rates were given as 1800 rpm for burst and 400 rpm for full-automatic. H&K was awarded the development contract (worth 20 million DM) on December 23, 1974. The contract required the completion of development by autumn of 1977 including following field tests. Subsequently, H&K contracted Hensoldt with a continuing development contract.