hk mr556a1




hk mr556a1 | mr556a1

A direct descendant of the world-famous HK416, the MR556A1 is the commercial carbine from the same DNA. It offers the battlefield-proven reliability, durability and precision you would expect from a rifle that bears the name Heckler & Koch. 

The MR556A1 is assembled in the USA using US and German-made components and uses many of the same parts and assemblies developed for the HK416.

Like the HK416, the MR556A1 uses a proprietary HK short-stroke gas piston in place of the direct-gas-impingement system found on lesser AR15-style rifles that propels exhaust gas into the upper receiver to operate the action. 

In the “closed” HK piston system, exhaust gasses never enter the receiver, which means the HK runs cooler, cleaner and more reliably. 

When adverse conditions, like dust, sand and mud are introduced, the advantage of the HK system becomes even more drastic. That is why so many of the world’s elite military and law-enforcement customers have absolute trust in their HKs.

The MR556A1’s barrel is cold hammer forged from the highest quality cannon-grade steel. It has a 1 in 7” twist and a taper-bore configuration, with a slightly smaller diameter at the muzzle for improved accuracy and velocity. And while the material and cold hammer forging process themselves greatly enhance durability, HK’s processes include many additional steps not taken by other manufacturers to produce superior accuracy and service life, ensuring performance well beyond “mil-spec.” 


ID Number UPC Codes Description MSRP
MR556 Rifle, 5.56mm, Optics Ready – supplied with one magazine, rifle length M-LOK handguard, and medium contour barrel
81000579 642230262553 MR556, 5.56mm, Optics ready, 16.5″ medium contour barrel, one 30rd magazine 3,499
81000580 642230262560 MR556, 5.56mm, Optics ready, 16.5″ medium contour barrel, one 10rd magazine 3,499
MR556 Spare Magazines and Accessories
81000584 642230262607 MR556, Upper Receiver kit – includes bolt, buffer, buffer spring, rifle length M-LOK handguard and 16.5″ medium contour barrel assembly 2,069
251770S 642230248311 MR556 5.56mm 30rd magazine (steel) 59
233609S 642230245334 MR556 5.56mm 20rd magazine (steel) 69
235642S 642230246492 MR556 5.56mm 10rd magazine (steel) 69
236204 642230247642 MR556 9″ quad rail handguard 379
50233617 642230247635 HK416 11′ handguard 416
51000223 642230262157 MR556 9″ M-LOK handguard, black 289
51001100 642230262683 MR556 12.5″ M-LOK handguard, black 299



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