Heckler & Koch MR556 A4 5.56 NATO Rifle
Heckler & Koch MR556 A4 features a short-stroke gas piston system, 16.5" threaded barrel, ambidextrous controls, M-LOK handguard, and Patriot Brown receiver. Designed for suppressed or unsuppressed operation with minimal maintenance.
Heckler & Koch MR556 A4: Modern Piston-Driven Performance
The MR556 A4 represents a refined approach to the modern rifle platform. Built around Heckler & Koch's proven short-stroke gas piston operating system, this rifle delivers reliability without the drawbacks of direct impingement designs.
Key Features
Operating System
- Short-stroke gas piston design eliminates hot carbon fouling in the receiver
- Adjustable gas regulator for tuned operation with or without suppressors
- Reduced wear on internal components and simplified maintenance
Ergonomics & Controls
- Fully ambidextrous controls for left and right-handed shooters
- Lightweight construction with slimmer profile for easier handling
- 6-position synthetic stock for length-of-pull adjustment
Specifications
- Caliber: 5.56 NATO
- Barrel: 16.5" with threaded muzzle
- Receiver: Patriot Brown Picatinny rail
- Handguard: M-LOK compatible for modern accessories
- Magazine: 10-round capacity
- Controls: Ambidextrous safety and charging handle
Why Choose the MR556 A4?
This rifle excels for shooters who value reliability and low maintenance. The piston system keeps your action cleaner, extends service intervals, and reduces component stress. Whether you're running suppressed or unsuppressed, the adjustable gas system ensures consistent performance. The ambidextrous design makes it equally at home with any shooter, while the modern M-LOK handguard accepts today's accessories without compromise.
