Heckler & Koch MR556 A4 Piston-Operated 5.56 NATO Patriot Brown Rifle

Description

Product Overview

The Heckler & Koch MR556 A4 is a semi-automatic 5.56 NATO rifle built around a reliable short-stroke gas-piston operating system. Its 16.5-inch cold hammer-forged steel barrel uses a 1:7 twist rate to stabilize a broad range of bullet weights and features a threaded muzzle for compatible muzzle devices. A free-floating M-LOK handguard supports accessory mounting while helping preserve accuracy. The rifle also includes a six-position adjustable synthetic stock, ambidextrous safety lever, optic-ready receiver rail, and a factory trigger pull set between 4.5 and 5.6 pounds. Finished in Patriot Brown, it combines adaptable controls with a durable, precision-oriented configuration.

Key Features

• Short-stroke gas-piston system provides dependable semi-automatic operation
• 16.5-inch cold hammer-forged barrel is designed for long service life and consistent accuracy
• 1:7 twist rate stabilizes a wide range of 5.56 NATO bullet weights
• Threaded muzzle accepts compatible muzzle devices and suppressors
• Free-floating M-LOK handguard provides flexible accessory mounting
• Ambidextrous safety lever accommodates right- and left-handed operation

The MR556 A4 offers a versatile piston-operated rifle platform for precision, training, sporting, and tactical applications.