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Heckler and Koch MR556A1 AR-15 Carbine 5.56/.223 16.5

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Buy Heckler and Koch MR556A1 AR-15 Carbine 5.56/.223 16.5 Online



More Information
SKU 3457279
UPC 642230262553
Brand Heckler & Koch
Model Name MR556
MPN 81000579
Caliber .223/5.56
Capacity 30+1
Magazines Included 1
Barrel Length 16.5″
Barrel Twist 1:7
Length 37.68″
Weight 8.6lbs
Sights Optic Ready Rail
Stock Adjustable
Grip Standard
Trigger Standard
Safety Cross Bolt Safety
Finish Black
Condition New in Box


 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 the 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 propel 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 barrel is a 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.” 


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