The Heckler & Koch MR556 A4 is built for dependable performance in range, duty-style, and general-purpose applications, delivering consistent operation through a short-stroke gas piston system and adjustable gas regulator. Shooters will find the platform suitable for training, precision work at the range, and versatile field use.

The MR556 A4 pairs a threaded 16.50″ black barrel with a Patriot Brown Picatinny rail receiver and an M-LOK handguard for modern accessory compatibility. Ergonomics include a 6-position black synthetic stock and fully ambidextrous controls, producing a slimmer profile that is easier to operate and manipulate.

Key Specifications

The caliber is 5.56x45mm.
The capacity is 30+1 rounds.
The barrel length is 16.50 inches.
The barrel finish is Black.
The barrel is threaded.
The receiver is a Patriot Brown Picatinny rail receiver.
The handguard is M-LOK.
The stock is a 6 position black synthetic stock.
The controls are ambidextrous.
The operating system is a short-stroke gas piston with an adjustable gas regulator.

The Heckler & Koch MR556 A4 offers reliable 5.56x45mm performance with modern accessory compatibility and user-focused ergonomics. Consider buying the Heckler & Koch MR556 A4 5.56x45mm online today to add a dependable platform to your collection or range lineup.