Out of stock
H&K MR .223 Rem/5.56 AR-15 Rifle - MR556-A1
Out of stock

H&K MR .223 Rem/5.56 AR-15 Rifle - MR556-A1

SKU 52679
Brand Heckler and Koch
Model Number MR556-A1
UPC 642230246454
Customers must read Compliance Information before purchasing.
This product is fulfilled by a PSA Partner and shipping times may vary.

Product Details


  • Series/Collection: MR
  • Action: Semi-Automatic
  • Stock Type: Adjustable, Retractable
  • Trigger Type: 2-Stage
  • Muzzle Type: Muzzle Brake
  • Magazine Capacity: 30
  • Caliber/Gauge: 223 Remington/5.56x45mm NATO
  • Twist Rate: 1:7"
  • Orientation: Right
  • Safety: Ambidextrous
  • Sight: Accessory Diopter/Rotary
  • Barrel Material: Cold Hammer Forged Steel
  • Receiver Material: Aluminum
  • Stock Material: Synthetic
  • Stock Finish: Black
  • Barrel Length: 16-1/2"
  • Overall Length: 33.9" to 37.68"
  • Weight: 8.6 lb
  • Width: 3.07"
  • Height: 9.45"
  • Trigger Pull: 7.64 lb
  • Sight Radius: 14.6"


A direct descendent of the HK416, the MR556A1 is a semi-automatic rifle developed by Heckler & Koch as a premium level commercial/civilian firearm with match rifle capability. Like the HK416, the MR556A1 is a major product improvement over conventional AR-type carbines and rifles. The MR556A1 uses the HK proprietary gas piston operating system, employing a piston and a solid operating "pusher" rod in place of the gas tube normally found in AR15/M16/M4-style firearms. The unchromed barrel has an internal profile of 6 lands and grooves with a 1 in 7 inches (178 mm) twist. It is also moderately "swagged" with a slightly smaller internal diameter at the muzzle end than the chamber end. This feature has a positive effect on bullet accuracy and velocity. The thick, heavy contour 16.5 inches MR556A1 barrel also contributes to its excellent accuracy. The MR556A1 rifle includes a 10 or 30 round steel magazine, set of Troy Industries Micro mechanical sights, HK multi-tool, lock, and case.


      Equipped with rugged, adjustable TROY micro sights
      True 5.56 mm chamber
      MR series rifles use the same free floating rail system as the HK416/417, ensuring the barrel does not come in contact with the handguard
      Accuracy is unaffected by accessories mounted on the rails, even after the FFRS handguard is removed and reinstalled, no re-zeroing of sights is required
      16-1/2 inches cold hammer forged barrel made of unlined cannon grade steel
      HK416 geometry magazine well for reliable function - works with a variety of magazines including aluminum US Mil-Spec and polymer EMAGs
      Ambidextrous safety/selector lever, unlike other AR-style rifles, HK MRs can be placed on safe even when the rifle is uncocked
      The HK-proprietary gas piston operating system prevents propellant gases and carbon fouling from entering into the receiver area, increasing the reliability of the rifle
      HK large palm swell target grip with storage compartment for optimum shooting, other accessory HK pistol grips available for custom fit, MR rifles can also accommodate standard grips made for M16/M4/AR15 type rifles
      MR series rifles are assembled in the USA of German and American made components
      For precision shooting, the six positon, adjustable MR buttstock can be tightlend and locked in place using an HK supplied tool, the HK adjustable buttstock has a storage compartment for extra batteries and other mission essential gear



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All NFA Rules Apply.
These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.
Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).