• H&K MR556A1 MR-556 30+1 5.56NATO 16.5"

    H&K MR556A1 MR-556 30+1 5.56NATO 16.5


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H&K MR556A1 MR-556 30+1 5.56NATO 16.5"

Factory New
Bud's Item #

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.

This method of operation virtually eliminates malfunctions that are common to direct impingement gas systems since hot carbon fouling and waste gases do not enter the receiver area. This is the same key feature critical to the success of the HK416 rifles used by leading military and law enforcement customers.

The MR556A1 is produced in the USA using American and German made components. The MR556A1 uses many of the same assemblies and accessories originally developed for the HK416 including the HK free-floating four-quadrant rail system.

The HK Free Floating Rail System (FFRS) handguard has four MIL-STD-1913 “Picatinny” rails and allows all current accessories, sights, lights, and aimers used on M4/M16-type arms to be fitted to the MR Series. The HK rail system can be installed and removed with simple tools and returns to zero when reinstalled.

The MR556A1 also has a Picantinny rail machined into the top of its upper receiver for mounting optics and mechanical sights. Unlike earlier prototypes, major subassemblies, including the MR556A1 upper receiver/barrel assembly, are fully interchangeable with other high quality AR-style firearms. MR556A1 upper receiver kits can be used to retrofit competing legacy AR systems.

Like the famous HK416, the MR556A1 uses a German-made barrel produced by Heckler & Koch’s famous cold hammer forging process. The highest quality steel is used in this unique manufacturing process producing a barrel that provides superior accuracy and long service life.

But unlike the HK416, the MR556A1 does not use a chrome-lined barrel. Chrome-lining can sometimes mask bore imperfections and negatively affect accuracy. For the new series of Heckler & Koch semi-automatic MR rifles, HK designers and engineers believe best accuracy comes with an unlined bore.

Used with the HK Free Floating Rail System, the barrel does not touch the handguard, ensuring the barrel is truly free-floating for maximum accuracy.

The unchromed barrel has an internal profile of 6 lands and grooves with a 1 in 7 inch (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-inch MR556A1 barrel also contributes to its excellent accuracy.

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 takedown pins ensure the upper and lower receivers are firmly mated for accurate performance.

Designed to function with a wide variety of high quality 5.56 x 45 mm ammunition, the MR556A1 uses a C.I.P. dimensioned chamber (a chamber with dimensions specified by the Commission Internationale Permanente).The MR556A1 also functions reliably with most quality Caliber .223 Remington ammunition.

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.

 *NOTE* rail system may differ from the one pictured.

Finish Black with Kryptek Typhon furniture
Action Break Open
Caliber 5.56 NATO
Barrel Length 8"
Overall Length 31.25"
Trigger CMC Curved
Safety Two Stage
Capacity 12
Stock BattleLink Minimalist Stock
Weight 8.6 lbs
Finish Matte Black
Action Semi-auto blowback
Caliber 30-06 Springfield / 50 Black Powder
Barrel Length 22" Vent Rib
Overall Length 28.75"
Trigger Adjustable AccuTrigger
Safety Manual Thumb Lever
Capacity 9 + 1
Stock Skeleton
Weight 8.6 lbs
Finish Black
Action Semi-Automatic
Caliber 5.56x45mm
Barrel Length 16"
Overall Length 33.9"-37.68"
Trigger Two Stage
Safety Ambidextrous
Capacity 30 + 1
Stock Adjustable
Weight 8.6 lbs
Finish Black Cerakote
Action Pump
Caliber 300 Remington Ultra Mag
Barrel Length 16.5 "
Overall Length 48.25"
Trigger 2 Stage
Safety Top Tang Safety
Capacity 8 + 1
Stock Walnut
Weight 8.6 lbs
Finish Silver
Action Lever
Caliber 405 Winchester
Barrel Length 1.62"
Overall Length 46 1/8"
Trigger CMC Flat
Capacity 26 + 1
Stock Turkish Walnut
Weight 8.6 lbs

*Please Note!! Many of our pictures are stock photo's provided to us by the manufacturer and do not necessarily represent the actual item being purchased. Please verify this picture accurately reflects the product described by the title and description on this page before you place your order.