HK MR556 A4 PISTOL 11″ 5.56 NATO 30RD | BLACK
HK MR556 A4 PISTOL 11″ 5.56 NATO with short-stroke piston system, cold hammer forged barrel, and full-length Picatinny rail.
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Description
HK MR556 A4 PISTOL Features
The HK MR556 A4 PISTOL is a compact, piston-driven 5.56 NATO platform engineered to deliver duty-grade reliability in a maneuverable format. Built around Heckler & Koch’s short-stroke gas piston operating system, it is designed to run cleaner and cooler than traditional direct impingement systems. The 11-inch cold hammer forged barrel supports consistent accuracy and extended service life, even under demanding firing schedules. Its compact configuration makes it well suited for vehicle operations, close-quarters environments, and range applications where reduced overall length is beneficial.
Forged upper and lower receivers provide structural rigidity and consistent fitment, forming a durable foundation for hard use. A continuous top Picatinny rail allows secure mounting of optics and backup sighting systems, while the handguard interface supports modern accessory attachment for lights and mission-specific equipment. The black hard-coat finish enhances surface protection against wear and environmental exposure. A mil-spec style single-stage trigger offers predictable break characteristics, and the overall control layout maintains the familiar ergonomics of the AR-pattern platform. The result is a balanced 5.56 NATO pistol that combines HK’s piston-driven engineering with adaptable configuration capability.
Specifications
Manufacturer: Heckler & Koch
Model: MR556 A4 Pistol
Operating System: Semi-Automatic, Short-Stroke Gas Piston
Receiver Construction: Forged Upper and Lower
Barrel Type: Cold Hammer Forged
Mounting Interface: Full-Length Top Picatinny Rail
Trigger Type: Single-Stage
Handguard Interface: Accessory-Compatible Rail System
Finish: Black Hard-Coat Treatment
Additional Notable Specs: AR-Pattern Controls, Piston-Driven Architecture
Specifications
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