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HK MR556



HK MR556 Semi Automatic, 16.5 inch Barrel, 30 round or 10 round


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HK MR556

HK MR556 Ships Free!

Heckler and Koch’s MR556 Semi-Automatic Rifle is a direct descendant of the HK416. Developed by HK as a premium level commercial/civilian firearm with match rifle capability, the MR556 is an improvement over conventional AR-type carbines and rifles.

HK’s MR556 uses the HK gas piston operating system. Employing a piston and solid operating “pusher” rod in place of the gas tube usually found in the AR15, M16 and M4 style weapons, this system is far superior. It virtually eliminates malfunctions since hot carbon fouling and waste gases do not enter the receiver area.

Can’t find the HK Rifle you are looking for? Xtreme Guns and Ammo carries a large inventory of Heckler and Koch Rifles in Stock and on Sale. Feel Free to chat with us online or call 832-363-3783 for all of your HK questions and needs.

HK MR556 Specifications:

  • 81000579 – HK MR556 One 30 Round Magazine (UPC: 642230262553)
  • 81000580 – HK MR556 One 10 Round Magazine (UPC: 642230262560)
  • Caliber: 5.56 NATO
  • Length: 33.68 – 37.68 inches.
  • Barrel Length: 16.5 inches
  • Barrel Twist: 1:7 inches, 6 lands/grooves
  • Operating System: Short Stroke Gas Piston
  • Sights: No Sights, Optics Ready Picatinny Rail
  • Trigger Pull: 7.64 pounds
  • Weight: 8.6 pounds
  • Handguard: M-LOK Compatible
  • Stock: HK Telescoping
  • Magazine: One 30 Round or One 10 Round
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Additional information

Weight 12 lbs
Magazine Size


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