Heckler and Koch MR556 A4 5.56 NATO 16.5" Black 10+1 81000828

Heckler and Koch MR556 A4

The Heckler and Koch MR556 A4 is a semi-automatic 5.56 NATO and .223 Remington rifle built on HK's short stroke gas piston AR platform. A 16.5 inch cold hammer forged barrel is threaded 1/2x28 and sits under a free float handguard with Picatinny rail space. Matte black furniture, an adjustable stock, and 10+1 capacity keep the rifle ready for range and duty style use.

The piston system is derived from the HK416 layout and is meant to run cleaner than a direct impingement gun. Ambidextrous controls work for right and left handed shooters, and the upper is optics ready with no iron sights installed. One 10 round magazine ships with the rifle. The free float handguard leaves room for a light, grip, or bipod without loading the barrel.

This MR556 A4 is well suited to training, competition, and defensive use where a piston 5.56 NATO rifle and a 16.5 inch barrel matter. Unloaded weight is 8.6 pounds, and overall length runs from 33.9 to 37.7 inches on the adjustable stock. Shooters who want a new HK with a cold hammer forged barrel and 10+1 capacity will find this black model a complete optics ready package.

Specifications