HK MR556 5.56 NATO Semi-Auto Rifle 30rd Magazine Black

The HK MR556 delivers military-grade reliability in a civilian-legal platform, engineered with the same piston-driven operating system trusted by special forces worldwide. This 5.56x45mm NATO rifle combines Heckler & Koch's legendary build quality with practical features for serious shooters.

What Makes This Different

Unlike direct impingement systems, the MR556 uses HK's proprietary short-stroke gas piston system that runs cooler and cleaner. The chrome-lined cold hammer forged barrel maintains sub-MOA accuracy through thousands of rounds while the monolithic upper receiver provides a rigid platform for optics. Free-floating handguards and ambidextrous controls set this apart from standard AR-15 configurations.

Key Features

• Short-stroke gas piston operating system eliminates gas blowback
• 16.5-inch cold hammer forged barrel with 1:7 twist rate
• Monolithic upper receiver with integrated Picatinny rail
• Ambidextrous safety selector and magazine release
• Free-floating quad rail handguard system
• Adjustable buttstock with multiple positions
• 30-round detachable magazine included

Field testing demonstrates consistent 1.5 MOA accuracy with quality ammunition, while the piston system maintains reliability in adverse conditions where direct impingement rifles struggle. The rifle excels in competitive shooting, tactical training, and hunting applications where precision and dependability matter most. Weather sealing and corrosion-resistant finishes ensure function in rain, sand, and extreme temperatures.

Technical Specs

• Caliber: 5.56x45mm NATO/.223 Remington
• Barrel Length: 16.5 inches
• Overall Length: 33-36.5 inches (stock dependent)
• Weight: 8.9 pounds (unloaded)
• Magazine Capacity: 30 rounds
• Twist Rate: 1:7 inches
• Finish: Black anodized aluminum/phosphate steel
• Country of Origin: Germany

Professional shooters and military contractors choose HK for mission-critical applications where failure isn't an option. The MR556 brings that same engineering excellence to civilian markets with full parts availability and factory support.