Caliber/Gauge
5.56x45mm
Barrel Length
16.5"
Action
Semi
Front Sight
None
Rear Sight
None
Color
Black
Finish
Anodized
Material
Aluminum
Handed
Right
The MR556A1 is a direct descendant of the world-famous HK416. It offers the civilian semi-automatic shooter battlefield-proven reliability, durability and precision you would expect from Heckler & Koch.
This latest update to the MR556A1 includes an updated grip and forearm as well as a lighter barrel profile that removes nearly a pound of front-end weight from the rifle.
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. That is where that legendary HK reliability comes from.
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 military and law-enforcement elite customers trust HK.
The MR556A1's barrel is cold hammer forged from the highest quality cannon-grade steel, with a slightly smaller diameter at the muzzle for improved accuracy and velocity. 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"
Caliber 5.56 x 45 mm NATO
Operating principle Gas operated, short stroke piston
Bolt system Rotating bolt
Magazine 10/20/30 rounds
Mode of fire Semi-automatic
Length, maximum (stock extended) 37 in / 940 mm
Length, minimum (stock retracted) 33.75 in / 857 mm
Width 3.07 in / 78 mm
Height 9.45 in / 240 mm
Barrel length 16.5 in /421 mm
Weight Rifle (with empty magazine) 7.60 lb / 3.45 kg
Trigger pull 7.64 lb / 34 N ( approximate)
Barrel profile 6 lands & grooves, right twist, 1 in 7 in (178 mm)
Sights Optics ready
Adjustable buttstock Six positon, adjustable MR buttstock
This latest update to the MR556A1 includes an updated grip and forearm as well as a lighter barrel profile that removes nearly a pound of front-end weight from the rifle.
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. That is where that legendary HK reliability comes from.
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 military and law-enforcement elite customers trust HK.
The MR556A1's barrel is cold hammer forged from the highest quality cannon-grade steel, with a slightly smaller diameter at the muzzle for improved accuracy and velocity. 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"
Caliber 5.56 x 45 mm NATO
Operating principle Gas operated, short stroke piston
Bolt system Rotating bolt
Magazine 10/20/30 rounds
Mode of fire Semi-automatic
Length, maximum (stock extended) 37 in / 940 mm
Length, minimum (stock retracted) 33.75 in / 857 mm
Width 3.07 in / 78 mm
Height 9.45 in / 240 mm
Barrel length 16.5 in /421 mm
Weight Rifle (with empty magazine) 7.60 lb / 3.45 kg
Trigger pull 7.64 lb / 34 N ( approximate)
Barrel profile 6 lands & grooves, right twist, 1 in 7 in (178 mm)
Sights Optics ready
Adjustable buttstock Six positon, adjustable MR buttstock
