Heckler & Koch MR556 A4 5.56 Rifle 16.5"
Heckler & Koch's MR556 A4 features a short-stroke gas piston system, adjustable gas regulator, and fully ambidextrous controls. 16.5" threaded barrel, 10-round magazine, M-LOK handguard, and optics-ready platform.
Heckler & Koch MR556 A4: Modern Rifle Engineering
The MR556 A4 represents thoughtful rifle design for shooters who demand reliability and ease of operation. This 5.56mm platform combines proven engineering with practical features that matter in real-world use.
Operating System
The short-stroke gas piston system is the heart of this rifle. Unlike direct impingement designs, the piston keeps hot carbon fouling out of the action, allowing extended shooting with less maintenance and reduced wear on internal components. The adjustable gas regulator lets you tune performance for either suppressed or unsuppressed operation—a genuine advantage for versatile shooters.
Ergonomics and Handling
Fully ambidextrous controls make this rifle equally at home in either hand. The slimmer profile and lighter weight (7.67 lbs) reduce fatigue during extended shooting sessions. The six-position synthetic stock adjusts from 33.25" to 36.5" in length, accommodating different shooters and gear configurations.
Specifications
- Caliber: 5.56mm NATO
- Barrel: 16.5" with 1:7" twist, threaded for suppressors
- Magazine: 10-round capacity
- Handguard: M-LOK compatible for mounting accessories
- Sights: Optics-ready platform (no iron sights)
- Trigger: 4.5–5.6 lb pull
- Dimensions: 3.07" width, 7.5" height
This is a rifle built for shooters who understand that quality engineering translates to reliable performance.
Features
- short stroke gas piston
- hk416 upper receiver
- m-lok handguard
