HK MR556A1 mm Rifle


HK MR556A1 5.56mm Rifle

  • MFR#: 81000533
  • UPC: 642230260221
  • CALIBER: 5.56/.223
  • MAGAZINE CAPACITY: 30 rounds
  • # OF MAGS: One
  • TYPE: Semi Auto Rifle
  • BARREL LENGTH: 16.5″
  • SIGHTS: Flip up Front and Rear
  • FRAME MATERIAL: Aluminum
  • CASE: Soft Rifle Bag



The HK MR556A1 is 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 available at different firearm sites.

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 mud are introduce, 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 a cold hammer forged from the high 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.”


  • Moreover, the 16.5″ cold hammer forged barrel, manufactured with the highest quality steel used for making cannon barrels.
  • HK proprietary short-stroke gas piston system.
  • Also, the Battle tested design.
  • HK Soft Rifle Case.
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  • One 30 round magazine.

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HK MR556A1 5.56mm Rifle

MFR#: 81000533

UPC: 642230260221

This is a serial firearm, and must ship to an FFL dealer. Please have your FFL dealer either fax or email a copy of their FFL license to us. Email:

If you choose the In Store Pickup option, a VSP SP-65 & ATF Form 4473 must be filled out at the time of pickup.


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