The HK MR556 A4 is a 5.56x45mm rifle engineered for consistent operation and longevity. This precision rifle incorporates a short-stroke gas piston operating system, which directs hot carbon fouling away from the action. This design contributes to reduced internal wear and minimizes the need for frequent maintenance, allowing for extended operational periods.
Key Features
Gas Piston Operating System
Unlike direct impingement designs, the MR556 A4’s advanced short-stroke gas piston system channels hot gases and carbon fouling away from the bolt group. This fundamental difference mitigates carbon buildup within the receiver, significantly reducing wear on critical components and enhancing operational reliability. An adjustable gas regulator allows operators to optimize performance for both suppressed and unsuppressed firing configurations, ensuring consistent cycle parameters.
Ergonomics and Control Interface
Designed for broad user compatibility, the MR556 A4 features fully ambidextrous controls, facilitating efficient manipulation from various shooting positions and for diverse user preferences. The rifle is equipped with a 6-position black synthetic stock, enabling rapid length-of-pull adjustments to optimize shooter interface and weapon balance.
Modular Accessory Integration
The 16.50-inch barrel features standard threading to accommodate a range of muzzle devices, including suppressors or compensators. The receiver-mounted Picatinny rail and integrated M-LOK handguard offer extensive, secure mounting options for optical systems, illumination devices, and other mission-essential accessories. This modularity supports rapid adaptation for various operational requirements, from competitive shooting to defensive applications.
Technical Specifications
- Caliber: 5.56x45mm
- Operating System: Short-Stroke Gas Piston
- Barrel Length: 16.50 inches
- Stock: 6-Position, Black Synthetic
- Controls: Fully Ambidextrous
- Accessory Interface: Integrated Picatinny Rail, M-LOK Handguard
- Muzzle: Threaded Barrel
