Steyr STM 556
Assault rifleAustria2012In service
Semi-automatic 5.56×45 mm NATO carbine built on the AR-15 platform, aimed primarily at the U.S. civilian and law-enforcement markets.
Assault rifle//Austria
ID — STEYR-STM-556
Designation
Steyr STM 556
Steyr Arms
Caliber
5.56×45 mm NATO
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Data trust
- Reliability
- Unverified
- Sources
- Sources pending review
Identity
- Designation
- Steyr STM 556
- Manufacturer
- Steyr Arms
- Country
- Austria
- Year
- 2012
- Category
- Assault rifle
- Status
- In service
Ballistics
- Caliber
- 5.56×45 mm NATO
- Muzzle velocity
- 900 m/s
- Effective range
- 500 m
Dimensions
- Barrel length
- 406 mm
- Overall length
- 820 / 900 mm
- Empty weight
- 3 kg
Mechanics
- Operating system
- Presa di gas diretta
- Bolt / action
- Otturatore rotante AR-15
Feed
- System
- Caricatore STANAG amovibile
- Standard capacity
- 30 rounds
Fire modes
SafeSemi-auto
Historical profile
Developed by Steyr Arms USA to meet American demand for high-quality European AR-pattern carbines.
It pairs a Steyr cold-hammer-forged barrel with a standard AR-15 direct-impingement action.
Available with a 16" barrel and telescoping stock, it is produced at the Bessemer, Alabama plant.
Key components
- ●Stock — Shoulder rest.
- ●Receiver — Weapon body with internal mechanisms.
- ●Grip — Primary grip.
- ●Magazine — Cartridge feed.
- ●Barrel — Guides the projectile.
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