H&K MR556 and MR762: Civilian HK416 and HK417

Steve Johnson
by Steve Johnson

H&K fans rejoice. The HK416 / HK417 piston driven AR-15 derivatives are finally coming in a semi-automatic form for civilians. The civilian 5.56x45mm HK416 is called the MR556 and the 7.62x51mm HK417 civilian equivalent is the MR762. They are expected to arrive in late 2009.


5.56x45mm MR 556

From HK:

A direct descendent of the HK416, the MR556 is a semi-automatic rifle developed by Heckler & Koch as a premium level commercial/civilian firearm. Like the HK416, the MR556 is a major product improvement of conventional AR-type carbines and rifles.

Using the HK-proprietary gas piston system found on the HK416 and G36, the MR556 does not introduce propellant gases and carbon fouling back into the rifle’s interior, making it the most reliable of any AR-type firearm.

The MR556 will be produced at Heckler & Koch’s new manufacturing facility at Newington, New Hampshire from American and German made components. To conform to German export regulations, certain design changes made in the MR556 prevents the rifle’s upper receiver from being used on other AR-style firearms.

So in other words this is not an AR-15 and in theory would not be banned as a named rifle on AWB 2.0.

Specs for the MR 556

Caliber: 5.56 x 45 mm NATO
Length, maximum (stock extended): 37.68″
Length, minimum (stock retracted): 33.90″
Overall width: 3.07″
Height: 9.45″
Barrel Length : 16.5″
weight (without magazine): 8.60 lb
Trigger pull : 7.64 lb
Barrel Profile: 6 lands & grooves, right twist, 1 in 7 in
Sight radius : 14.60″

Oddly enough both models are being shipping with 10 round magazines … AWB 2.0 fears?


7.62x51mm MR 762

Specs for the MR 762
Length, maximum (stock extended) : 39.10″
Length, minimum (stock retracted) : 35.94″
Overall width: 3.23″
Height : 8.36″
Barrel Length: 16.6″
Weight (without magazine): 9.60 lb
Trigger pull: 7.64 lb
Barrel Profile: 6 lands & grooves, right twist, 1 in 12 in
Sight radius: 16.14″

I will update this page as more information becomes available.

Steve Johnson
Steve Johnson

I founded TFB in 2007 and over 10 years worked tirelessly, with the help of my team, to build it up into the largest gun blog online. I retired as Editor in Chief in 2017. During my decade at TFB I was fortunate to work with the most amazing talented writers and genuinely good people!

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  • GB GB on Nov 19, 2013

    Just purchased a Mr-762, and need to know the specs on the muzzle break threads. Is it with standard or metric threads. I want to purchase a Nights Armorment Mam's muzzle break , but I'm told that they are not Compatible. Any input ?

  • Jeanal5dogs Jeanal5dogs on Apr 08, 2014

    I'm ignert and have a question... Are the mags for the MR762a1 interchangeable with other AR style 762 x 51s? Or are they propretary? that will determine whether i shell out the money.

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