From the very beginning, it was obvious the required hit probability could not be achieved with common iron sights, hence, it was given equal importance. Only an optical sight could do it. The Hensoldt AG, having delivered 100,000 optical sights for the G3, cooperated with H&K on developing a small sight with low power magnification which would allow target acquisition with both eyes. However, due to cost reasons it was dropped. As the weapon was to be short only 37 cm would have been left for a sightline, too short for a common iron sight, hence, it was out of the question. In mid 1968, Hensoldt presented an affordable reflector sight. It was based on an old and nearly forgotten patent, and a modernized model had to be built by a master from the assembly department. On September 30, 1968, Hensoldt was commissioned for a study for further development.