Rheinmetall Steyr RS556
Country of origin






Year(s) designed


Production began

2019 (projected)

Weapon type

Assault rifle


5.56×45mm NATO


Gas-operated, short-stroke piston operation

Barrel length

14.5 inches (36.8 centimeters)
16 inches (40.6 centimeters)
18 inches (45.7 centimeters)
20 inches (50.8 centimeters)


9.26 pounds (4.2 kilograms) with 16 inch barrel

Magazine/Cylinder capacity

30-round STANAG magazine

The Rheinmetall Steyr RS556 is a Austro-German modular assault rifle.


The RS556 was jointly created by Rheinmetall and Steyr as a modular weapon system to potentially replace the Heckler & Koch G36 currently in service.

Design details

The RS556 is looks similar to an AR-15, but is a derivative of the Steyr AUG. It is based on the Steyr STM556, an assault rifle Steyr announced in 2012. The rifle is available in three configurations; assault rifle, carbine and light machine gun configurations, has four hammer-forged barrels of different lengths which can be replaced without tools and a special service coating which allows the weapon to work without lubrications. It has multiple Picatinny rails, such as MIL-STD-1913, STANAG 2324 and STANAG 4694 rails, which allows it to mount various accessories and optics. The RS556 is claimed to have a special breech system with an "emergency operation feature" which allows it to operate reliably in extreme conditions such as extremely hot weather. It is compatible with Rheinmetall's "Future Soldier - Expanded System" and can be connected to other similar systems.

External links

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