Rheinmetall and Steyr Mannlicher, have joined forces to manufacture and market the RS556 modular assault rifle. The RS5565.56mm x 45 modular assault rifle is based on the STM556 design, which Steyr Mannlicher first unveiled in 2012.
This weapon is a possible candidate for the new “System Sturmgewehr Bundeswehr” program. The German armed forces intend to replace their standard Heckler & Koch G36 assault rifle with a new system starting in 2019.
Featuring an adjustable short-stroke gas piston system and rotating bolt, the gas-operated RS556 is based on the tried-and-tested Steyr Mannlicher AUG, or Universal Army Rifle. With a 16″ barrel (406 mm) and a fully loaded, 30-round magazine, the RS556 weighs around 4.2 kg. The adjustable-length light-weight stock clicks into seven different positions.
A number of standard barrel lengths are available (14.5″, 16″, 18″ and 20″); however, customer-specific barrel and rifling lengths can be created.
The RS556 features several standard and optional NATO accessory rails with receiver systems designed in accordance with MIL-STD-1913, STANAG 2324 and STANAG 4694. The weapon can be fitted with various optics and night observation devices or laser light modules. A 40mm grenade launcher can also be mounted on the new assault rifle. A special breech system with an emergency operation feature ensures that the weapon functions reliably in severely hot and cold environments.