Heckler & Koch MR556 A4 5.56 NATO 16.5" Patriot Brown Black 30+1 81001203

Heckler & Koch MR556 A4

The Heckler & Koch MR556 A4 is a premium semi-automatic rifle chambered in 5.56 NATO, derived from the renowned HK416 with a short-stroke gas piston system for enhanced reliability and reduced fouling compared to direct impingement designs. Featuring a 16.5-inch cold hammer-forged threaded barrel, Patriot Brown anodized aluminum receiver, and black M-LOK handguard, this rifle combines rugged durability with modern tactical versatility. The ambidextrous controls, including safety selector, magazine release, and charging handle, ensure intuitive operation for all shooters in demanding conditions.

Key performance elements include a 1:7 twist rate for stabilizing a wide range of projectiles, free-floating handguard for consistent accuracy, and adjustable 6-position stock for customizable fit. The forged construction with hard anodized finish provides corrosion resistance and long-term reliability, while the overall balanced design promotes quick handling and reduced recoil during sustained fire. These refinements deliver smooth cycling, minimal maintenance, and superior control in a proven platform optimized for professional use.

Ideal for tactical operations, competitive shooting, or range training, the MR556 A4 excels where reliability, modularity, and precision are critical. Its piston-driven operation, high-capacity magazine compatibility, and ambidextrous features make it an outstanding choice for shooters demanding elite performance with enhanced ergonomics and adaptability in dynamic environments.

Specifications