Description

The Steyr STM-Z 556 is engineered to meet the demands of both professional operators and elite sport shooters. By utilizing a monolithic one-piece upper receiver, the STM-Z ensures absolute structural rigidity and optic zero-retention. The rifle’s standout feature is the AUG-style quick-change barrel system, allowing the 417mm (16.4″) cold-hammer-forged barrel to be swapped in seconds without the need for specialized tools.

The internal mechanism utilizes a short-stroke gas piston with a four-position adjustable gas regulator, optimized for standard use, adverse conditions, and suppressed fire. To ensure durability in extreme environments, the bolt carrier and critical internal components are finished with a high-tech PVD coating, enabling “dry lubrication” for smooth cycling even with minimal maintenance. Fully ambidextrous controls and a proprietary Steyr tactical stock complete this ultra-modern firearm.