Experimental assault rifle Rheinmetall RH-70 was created by the designers of the same German company in 1970 year. The rifle was made by the bull-pap (English bullpup) scheme that was gaining popularity in those years. Most often, this term refers to the layout of small arms, in which the trigger is brought forward and is in front of the percussion mechanism and magazine. This scheme has a number of significant advantages.
The advantages of the bullpup layout are obvious enough - it allows you to get rid of the "dead" butt space, taking this place with the mechanism of the weapon itself. The resulting gain in the length of the small arms with the same barrel length is quite significant. For example, with an equal length of the barrel, which is 50 cm, the M16A2 rifle made according to the traditional pattern has a length of 100 cm, and one of the most well-known examples of bull-papas Steyr AUG has a total length of 80 cm. It is important infantry, which are forced to spend a lot of time in military equipment (in armored personnel carriers, infantry fighting vehicles, helicopters), which is not different interior space, the dimensions of the weapon are of great importance. Therefore, reducing the size of small arms seems to be justified and very significant.
Also, the smaller dimensions of small arms are a significant advantage during the conduct of hostilities in confined spaces, in forest areas, etc. The use of “traditional” folding butts on weapons is partly able to solve this problem. However, with a folded butt, aiming fire is almost impossible. Bringing the butt from the folded marching position to the combat requires a certain time, and in battle even a second of delay can cost the soldier his life. In addition, the weapons built according to the bullpup scheme allow in extreme cases to fire with just one hand, even if the accuracy of the fire will significantly suffer.
The main advantages of the bullpup scheme:
- solution of the issue with the “dead” space in the form of a butt;
- a significant reduction in the length of the weapon while maintaining the same length of the barrel;
- reduction of the shoulder recoil of the weapon, which adversely affect the accuracy when shooting.
For the first time, this scheme was used on the Korobov TKB-454-43 design automaton, but global recognition came to this scheme only at the beginning of the 70-s of the 20th century. It was at this time in West Germany that specialists from the well-known company Rheinmetall-Industrie-GmbH (Düsseldorf) developed a promising automat, designated RH-70. This machine from the company Rheinmetall had a bullpup layout, but he was not lucky enough to go into the series, and he remained an experimental model.

The bolt of this assault rifle was semi-free with roller braking. Open sighting devices on the weapon was not. The rifle scope, which was built into the grip used to carry the assault rifle, was to be used as a standard. The weapons were powered using a detachable magazine with a single-row arrangement of cartridges (on 30 cartridges). The box of the machine was made of wood.
The Rheinmetall RH-70 assault rifle was designed as a weapon for testing the bullpup concept, which is gaining popularity, and was designed for the low-pulse cartridge 5,56x45 NATO. The machine gun was considered as a possible replacement for the HK G3 caliber 7,62 mm, which was already in service with the Bundeswehr. Due to the use of the bullpup scheme, the total length of the Rheinmetall RH-70 submachine gun was reduced by 235 mm compared to the G3 automat. At the same time, in the development of the Rheinmetall concern, the barrel was longer on the 20 mm and the weight of the weapon was more than on the 1 kg.
Despite the novelty and a number of good characteristics, the Rheinmetall RH-70 submachine gun was not considered by representatives of the defense department as a possible standard weapon for the German army. The assault rifle was not accepted for arming the army, nor were the plans to put the machine into service with the German police special forces units. One of the significant shortcomings for the army machine was its very long single-row magazine for 30 cartridges.
Technical characteristics of Rheinmetall RH-70:
Automatic caliber - 5,56 mm.
Overall length - 790 mm.
Barrel length - 470 mm.
Weight - 3,28 kg.
Shop - on 30 cartridges, single row.
The initial speed of the bullet - 940 m / s.
Information sources:
http://www.dogswar.ru/oryjeinaia-ekzotika/strelkovoe-oryjie/1524-opytnyi-avtomat-rhei.html
http://weapon.at.ua/load/290-1-0-852
http://weapon.at.ua/publ/14-1-0-119
http://www.megasword.ru/index.php?pg=1107