A direct descendant of the HK416, the MR556A1 is a semi-automatic rifle developed as a premium level commercial/civilian firearm with match rifle capability. 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 which virtually eliminates malfunctions common to direct impingement gas systems since hot carbon fouling and waste gases do not enter the receiver area. The MR556A1 uses the HK Free Floating Rail System (FFRS) handguard with four MIL-STD-1913 Picatinny rails, and a machined Picatinny rail on the upper receiver. Major sub assemblies, including the MR556A1 upper receiver/barrel assembly, are fully interchangeable with other high quality AR-style firearms. The thick, heavy contour 16.5" barrel has 6 lands and grooves with a 1:7 " twist, and is moderately swagged with a slightly smaller internal diameter at the muzzle end than the chamber end for better bullet accuracy and velocity. A precise, enhanced two-stage trigger adds significantly to the accuracy of the MR556A1, and an extended latch charging handle makes operating the rifle with a telescopic sight easier. The retractable buttstock can be locked into a solid, non-moving position by tightening an Allen screw in the bottom of the stock. Special target rifle take-down pins ensure the upper and lower receivers are firmly mated for accurate performance. Designed to function with a wide variety of high quality 5.56x45mm ammunition, the MR556A1 uses a C.I.P. dimensioned chamber, and functions reliably with most quality 223 Remington ammunition. The MR556A1 is produced in the USA using American and German made components. The MR556A1 is being produced with the same commitment to quality as German-made HK firearms. By using joint U.S./German manufacturing, Heckler & Koch leverages the relative strengths of two continents to make the preeminent AR-type firearm, combining the designs innovations of the USA and Germany into one new product.
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Action : Semi-Automatic
Caliber : 223 Remington/5.56 NATO
Barrel Length : 16.5"
Capacity : 30+1
Trigger : Two Stage
Safety : Ambidextrous
Stock Description : 4-Position Black
Metal Finish : Black
Muzzle : A2 Muzzle Brake
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Submitted By: William J D. On 08/16/2016
I received the rifle but very long processing time. I ordered on July 27 and received it on August 9th. It came in a box in the H&K case but no other effort was made to protect it in shipping. The rifle seemed to have carbon stains on the piston that took quite a effort to remove. It took several applications of losso to remove it. The bore was very dirty and had copper fouling. I contacted H&K and they claim that a rifle without sights was fired 12 times. That could be enough to deposit copper but the carbon stain I question. After the break in I will fire 20 rounds and see if I can stain the piston in that few of rounds fired.
The rifle is a dream all I expected and more. The craftsmanship and materials are just superb. Much better than any picture can show. The rifling shines like its chrome but it's not. I wanted to wait to do my review but the seller wanted it now. :)
[5 of 5 Stars]