The HK MR556 A4 represents the pinnacle of civilian-legal AR-style rifle engineering, delivering the legendary reliability, precision, and durability that define Heckler & Koch. Derived from the battle-proven HK416 platform, the MR556 A4 is purpose-built for shooters who demand uncompromising performance, premium materials, and refined craftsmanship.
Chambered in 5.56×45mm NATO, the MR556 A4 features a 16.5 cold hammer-forged barrel engineered for long service life and exceptional accuracy. HKs renowned short-stroke gas piston operating system reduces fouling, heat transfer, and wear compared to direct-impingement systems, resulting in smoother operation and enhanced reliability under high round counts.
The rifle is equipped with a free-floating M-LOK handguard, providing rigidity and modular mounting capability for optics, lights, grips, and accessories. Ambidextrous controlsincluding the safety selector and charging handlemake the MR556 A4 fully adaptable for both right- and left-handed shooters.
Finished in a durable black anodized coating, the MR556 A4 delivers a clean, professional appearance while standing up to hard use on the range or in training environments.
Specifications
| UPC/EAN | HKO8100827 |
|---|---|
| Manufacturer Part Number | 81000827 |
| Brand | Heckler & Koch |
| Caliber | 5.56 x 45mm (NATO) |
| Barrel Length | 16.5″ |
| Optics Ready | No |
| Gun Color/Finish | Steel |
| Gun Action | Semi Auto |
| Overall Length | 36 |
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