Heckler & Koch MR556 5.56 NATO AR-15 Rifle - 30 Round - 16.6"

Manufactured by Heckler & Koch
SKU: 81000579
MPN: 81000579
Manufactured by Heckler & Koch
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Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal-Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to ffl@primaryarms.com.



The Heckler & Koch MR556A1 is a commercial carbine offering reliability, durability, and precision similar to the HK416. The MR556A1 is driven by the same incredibly short-stroke gas piston action to propel gas into the upper receiver to operate the action. An extremely accurate 16.5" cold hammer-forged barrel and lightweight free-float modular handguard give you every advantage in range. Other features include a two-stage trigger for precision, extended latch charging handle, retractable buttstock, and an optics-ready top rail.

  • Cold hammer-forged 16.5" medium contour barrel
  • Short stroke gas piston action
  • Ambidextrous safety selector
  • Ambidextrous charging handle
  • HK Modular Rail System handguard
  • Flat top receiver for optics
  • Collapsible carbine stock
  • Includes one 30-Round Magazine
Heckler & Koch has been a leading designer and manufacturer of small arms and light weapons for law enforcement and military forces worldwide for over half a century. Because of this experience, they can take what they have learned and apply it to the sporting and commercial markets to produce innovative and technically advanced products. Their products range from sub-compact handguns to the widely popular piston-driven semi-automatic rifles. The durability of these pistol and rifle systems makes them highly cost-effective when analyzing the long-term life cycle. Heckler and Koch is committed to being a leader and innovator in the firearms industry by having a "no compromise" attitude so that their customers receive the best possible products.
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Barrel Coating
Barrel ContourMedium
Barrel Length16.5
Barrel MaterialSteel
BrandHeckler & Koch
Caliber Gauge5.56 NATO
Magazine Capacity30
Twist Rate1:7
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

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