The Heckler & Koch MR556 A4 is the commercial variant of the HK416 family designed for reliable semi-automatic performance in a modern sporting rifle platform. It uses a short-stroke gas piston operating system and an adjustable gas regulator to improve long-term reliability and to accommodate suppressed or unsuppressed use. The rifle includes fully ambidextrous controls and contemporary furniture for operational versatility in range, training, and practical shooting roles.
Key Specifications
- The rifle is chambered in 5.56 NATO / .223 Rem.
- The barrel measures 16.5 inches and is threaded for muzzle devices.
- The standard magazine capacity is 30 rounds with one 30-round magazine indicated.
- The action type is semi-automatic.
- The operating system is a short-stroke gas piston for reduced fouling in the receiver.
- The stock is a polymer 6-position collapsible configuration.
- The overall length is listed as 36.5 inches (stock extended).
- The barrel twist is specified as 1:7 inch right-hand twist.
- The muzzle thread pattern is 1/2×28.
- The handguard is an M-LOK design with a Picatinny top rail.
The MR556 A4 combines HK engineering with modern ergonomics and features intended for sustained, practical use. Its piston system, threaded barrel, and ambidextrous controls make it a versatile choice for shooters who prioritize durability, straightforward maintenance, and functional configurability in a sporting rifle platform.
Product information is supplied by the manufacturer and/or distributor and may be automatically formatted or enhanced using AI for clarity and consistency. While we strive for accuracy, specifications, features, and included items may change without notice. Always verify details using the manufacturer’s official documentation and the information shown on this product page before purchase or use.
