HK MR556 A1 5.56mm NATO 16.5in Black Semi-Automatic Modern Sporting Rifle – 10+1 Rounds

The HK MR556A1 5.56mm NATO rifle is a civilian version of the iconic HK416, engineered for shooters seeking unmatched accuracy, reliability, and tactical performance. This semi-automatic rifle combines match-grade precision with the proven durability of HK’s gas piston system, making it ideal for home defense, tactical training, and competitive shooting.

Cold Hammer Forged Barrel & Precision Engineering

Featuring a 16.5-inch barrel produced using HK’s legendary cold hammer forging process, the MR556A1 ensures long-lasting durability and exceptional accuracy. The thick, heavy-contour barrel is slightly “swagged” at the muzzle end for enhanced bullet velocity and tighter groupings. This high-quality barrel construction is perfect for long-range target practice, tactical drills, and AR-style precision shooting.

Reliable Gas Piston System

The MR556A1 employs HK’s proprietary gas piston operating system with a solid operating “pusher” rod. This design virtually eliminates malfunctions common in direct impingement systems, keeping hot gases and carbon fouling out of the receiver. Shooters enjoy smoother operation, reduced maintenance, and longer component life, making this rifle ideal for extended shooting sessions.

Modular Rail System & Optics Ready

The free-floating HK Modular Rail System (MRS) handguard is ergonomically designed for maximum control while retaining key attachment features from previous FFRS models. The rifle also includes a Picatinny rail on the upper receiver for mounting optics, scopes, or tactical sights. The MR556A1 is supplied with a 9-inch MRS handguard and Troy microsights, providing a ready-to-use, optics-ready tactical rifle platform.

Features and Accessories

• 10+1 round magazine for practical shooting and range use
• Ambidextrous safety for left- or right-handed shooters
• Two-stage match trigger for precise control
• Muzzle brake for reduced recoil and enhanced stability
• Adjustable stock with 33.9 to 37.68-inch overall length
• Aluminum receiver and black polymer grip for lightweight durability
• 16-inch cold hammer forged barrel with 1:7 twist optimized for 5.56mm NATO ammunition

Specifications

Why Choose the HK MR556A1 10+1 Semi-Automatic Rifle?

The HK MR556A1 delivers the performance, reliability, and tactical precision expected from Heckler & Koch. Whether you are looking for a civilian AR-style rifle for home defense, a match-grade rifle for competitive shooting, or a reliable training rifle to mirror military-grade HK416 performance, the MR556A1 offers unmatched quality. With its optics-ready design, ambidextrous controls, and superior cold hammer-forged barrel, this rifle is built for shooters who demand accuracy, durability, and tactical versatility.