Heckler & Koch MR556 A4 5.56mm Rifle
Modern sporting rifle chambered in 5.56mm with 16.5" threaded barrel, short-stroke gas piston system, ambidextrous controls, and 30-round magazine capacity. Optics-ready platform with adjustable gas regulator.
Heckler & Koch MR556 A4: Modern Engineering Meets Practical Design
The MR556 A4 represents a thoughtful evolution in modern rifle design. Heckler & Koch's short-stroke gas piston operating system delivers a fundamental advantage: it keeps hot carbon fouling out of the action, allowing the rifle to run longer between cleanings with less wear on internal components.
Key Features
- Short-stroke gas piston system with adjustable gas regulator for tuning to suppressed or unsuppressed operation
- 16.5" threaded barrel in 5.56mm for modularity and accessory compatibility
- Fully ambidextrous controls for both right and left-handed shooters
- M-LOK handguard for modern accessory mounting
- 6-position adjustable stock with extended length of 36.5" and retracted length of 33.25"
- Optics-ready upper receiver with Picatinny rail
- 30-round magazine capacity
Specifications
This rifle weighs 7.67 pounds and measures 3.07" wide and 7.5" tall. The barrel features 6 lands and grooves with a 1-in-7" right-hand twist, optimized for a wide range of 5.56mm ammunition. The trigger breaks at 4.5 to 5.6 pounds—a clean, predictable break suitable for both tactical and precision applications.
Why the MR556 A4 Matters
The combination of piston-driven reliability, lighter weight, and slimmer profile makes this rifle easier to operate and manipulate in real-world conditions. Whether you're building a home defense platform, a competition rifle, or a general-purpose modern sporting rifle, the MR556 A4 provides the foundation for a versatile, low-maintenance system.
Features
- short stroke gas piston
- hk416 upper receiver
- m-lok handguard
