Steyr-Mannlicher STM556

Assault Rifle / Assault Carbine

Austria | 2012

"The STM556 is designed to compete in the crowded AR-15 market - offered by the Austrian concern with a quick-change barrel feature and ambidextrous controls."

Image from official Steyr-Mannlicher marketing materials.

Authored By: Staff Writer | Last Edited: 09/03/2023 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.

The Steyr SSM556 is an AR-style semi-automatic rifle offering from Steyr-Mannlicher of Austria. As its designation suggests, the action accepts the popular 5.56x45mm (.223 Remington) intermediate rifle cartridge and this is fed from a 10-round detachable box magazine inserted into the bottom of the lower receiver. Overall length of the gun is 35.55 with the stock extended and 32.95 with the stock collapsed. Weight is 8.15lb sans the magazine assembly. Barrel length is 16.4 inches.

The arrangement of this rifle is conventional: a shoulder support component is seated at the rear of the frame with the barrel protruding ahead. The barrel is partly shrouded in a slotted / perforated foregrip featuring accessory mounting rails both over the frame/handguard sections as well as under the handguard. The magazine well is located ahead of the trigger unit which integrates the ergonomic, rear-ward slanted pistol grip. The action sits above the magazine feed and the cocking handle is set at the rear of the receiver. The upper receiver is of a monolithic design approach while the ejection port is typically set to the right side of the body. The stock is completed in a high strength synthetic material and can be set at six different positions.

Internally, the weapon relies on the proven short-stroke piston arrangement. There is an in-built AUG-style Quick-Change Barrel (QCB) capability for replacing damaged / fatigued barrel assemblies. The weapon is designed to be ambidextrous to support both left- and right-handed shooters. The trigger is of semi-automatic action and a 2-poind ambidextrous safety mechanism is standard.

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Performance
Performance specifications presented assume optimal operating conditions for the Steyr-Mannlicher STM556. Information presented is strictly for general reference and should not be misconstrued as useful for hardware restoration or operation.

1,650 ft
502.9 m | 550.0 yds
Max.Eff.Range

900
Rounds-Per-Minute
Rate-of-Fire

2,900 ft/sec
884 m/sec
Muzzle Velocity

Physical
The physical qualities of the Steyr-Mannlicher STM556. Information presented is strictly for general reference and should not be misconstrued as useful for hardware restoration or operation.

850 mm
33.46 in
O/A Length

370 mm
14.57 in
Barrel Length

6.33 lb
2.87 kg
Weight

Selective Fire; Gas-Operated; Short-Stroke Piston
Action

5.56x45mm NATO (.223 Remington)
Caliber(s)

10-round detachable box magazine
Feed

Iron Front and Rear; Optional Optics
Sights

Variants
Notable series variants as part of the Steyr-Mannlicher STM556 Assault Rifle / Assault Carbine family line.

STM556 - Base Series Designation.

RS556 - Assault rifle form offered by Rheinmetall of Germany and Steyr-Mannlicher; variable barrel lengths; 4.2kg weight; lightweight adjustable stock; standard and optional accessories rail support.

Operators
Global customers who have evaluated and/or operated the Steyr-Mannlicher STM556. Nations are displayed by flag, each linked to their respective national small arms listing.

Contractor(s): Steyr-Mannlicher - Austria / Rheinmetall - Germany

[ Austria; United States ]

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Image from official Steyr-Mannlicher marketing materials.

Going Further...
The Steyr-Mannlicher STM556 Assault Rifle / Assault Carbine appears in the following collections:

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