936-295-5786 Facebook Twitter.com/AblesSporting BBB Accredited Business Seal

Buying Guns Online
Shipping & Returns
Return Form
Restricted Items
Contact Us
Premium Guns
Able's Gun Club
Employment Opportunities
Conditions of Use
Gun Specials
Ammo Specials
Current Sales Ad
Sign up for our e-mail newsletter for
special offers, discount coupons and more.

Worthy Causes
   Donate to Warrior and Family Support Center
   Halo For Freedom Warrior Foundation
Donations Put to Work
Gift Credit:   $0.00

Transfer Gift Credit

Info content that wraps to some degree
Forgot Password? Click here.

Home » Firearms » Rifles » Shop by Rifle Caliber » 223 REMINGTON/5.56
Tuesday 25 October, 2016  

Heckler & Koch MR556-A1 AR-15 Rifle MR556A1, 223 Remington/5.56 Nato, 16.5 in, Black Synthetic Adjustable Stock, Black Finish

MPN:  MR556A1 UPC:   642230246454
Heckler & Koch MR556-A1 AR-15 Rifle MR556A1, 223 Remington/5.56 Nato, 16.5 in, Black Synthetic Adjustable Stock, Black FinishOut-of-Stock
(0 reviews) Be the First to Review this Item


Free Shipping



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.

Mfg Item Num: MR556A1
Action: Semi-Automatic
Caliber: 5.56mm Nato (223 Remington)
Bbl Length: 16.5 "
Capacity: 30 + 1
Trigger: Standard
Safety: Lever
OAL: 33.9"-37.68"
Weight: 8.91 lbs
Stock: Black Synthetic Adjustable
Finish: Black

View All Items by this Manufacturer

Special Deals

New Products - In Stock Now!
Estimated Shipping Weight: 9.000       Print Frindly View Print this Page
Similar Products - In Stock Now

Attention!   Firearm Restrictions - See Below...  ↓

* By Federal law, we can only ship firearms to an FFL licensed gun dealer.
* Add your selected firearm(s) to your shopping cart and proceed to check out.
* During checkout select a local Federal Firearms Licensed (FFL) Dealer that will accept the firearm.
* The firearm(s) will not be reserved until payment and a signed copy of a dealer's FFL have been received.
Please read How To Buy Guns Online before purchasing a firearm from us.
Return to manufacturer for warranty service. No Returns.
Note: Able's reserves the right to modify or change product information, quantity and pricing at any time without notice.
Many of our pictures are stock photos provided by the manufacturer, so please verify this picture accurately reflects the product described.
Images, descriptions, etc. do not necessarily represent the product in its entirety and are shown for examples only.
Not all items listed online are in stock in our Huntsville, TX retail store. Please call to verify availability.
**Free Ground shipping only within 48 contiguous states. May be subject to availability or other restrictions.

Top Categories
Frequently Asked Questions
Privacy Policy
Conditions of Use
All Manufacturers
Buying Guns Online
Restricted Items
Shipping Policy
Return Policy
Donations Put to Work
Employment Opportunities
Contact Us