Heckler Koch HK MR556A1 5.56 Rifle
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 certain 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.
NOTE: MUST READ FOR FIREARM AND LOWER RECEIVER ORDERS:
THIS IS A SERIALIZED FIREARM. IT MUST SHIP TO AN Federal Firearms License holder. No civilian exceptions.
When you check-out: We no longer take PayPal, as it has caused some confusion on the purchase of firearms, which is contrary to PayPal policies, and we had no way to restrict it just for FFL items.
A firearm cannot be sent directly to you. I am sure you know this, but for the fake-news reading this, who might think that a firearm can be mailed to a buyer, I have to reiterate: A firearm or federal regulated serialized item (like a receiver or suppressor), only a federally licensed firearms dealer may receive such an item. It would be good to know your FFL and their shipping address before purchasing. If you know the FFL address, please put this in your shipping address at check-out. Any deviation from this, and your order could be delayed. Sorry, have to have strict controls here. We have a very manual process to reconcile orders to FFL transfer agents. The easier you make it for us, the less likely your order will be held-up. This is a highly regulated process, and compliance is monitored and enforced by the ATF.
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Note: California residents, click here for CA compliant processing. This will also work for New York residents. We will act on your behalf and instructions to ship to restrictive states, but ultimately, it is your responsibility to know the local and state laws. We are in Virginia, and cannot, and do not know all the nuances of other states. If we ship to your FFL, and there is an issue, we cannot accept a return, so please make sure that you know and follow your local and state laws.
Please note our shipping timelines. We do not ship immediately. Also, if you choose the free 5-7 day shipping, those orders ship after all other forms of shipping chosen. Express shipping is given priority.
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|Rifle Overall Length:||33.9" - 37.68"|
|Safety:||Ambidextrous selector lever|
|Rifle Barrel Length:||16.50"|
|Rifle Barrel Twist:||1:7"|
|Rifle Stock:||Reinforced carbon-fiber polymer|
|Scope Mount:||Free floating rail|
|MPN||MR556-A1 / 81000068|