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Heckler and Koch MR556 A1 16.5" MR556A1 HK H&K AR-15 5.56mm Piston 30+1 SALE PRICE No CC Fee NEW IN BOX

For Sale from: Cornerstone Arms
( FFL) |
Positive feedback: 99% View |
Verified Seller
| 2893 Completed Sales

Heckler and Koch MR556 A1 16.5" MR556A1 HK H&K AR-15 5.56mm Piston 30+1 SALE PRICE No CC Fee NEW IN BOX

For Sale from: Cornerstone Arms |
Positive feedback: 99% View |
Verified Seller
| 2893 Completed Sales
SOLD - $2,575.50

Shipping: $31.50 (or Arrange local transfer)
Accepted Payment Methods: Visa MasterCard Discover Check Money Order
Returns: 3 Days
This Seller Accepts Instant Online Payments

Description: NO Credit Card Fees Like the Other Guys!! Read Their Fine Print!! This Listing is for One Factory Brand New in the Box H&K MR556A1 5.56mm Semi-Auto Piston Driven AR-15 Rifle. Factory Part # MR556A1

The MR556A1 rifle includes a 30-round steel magazine, set of Troy Industries Micro mechanical sights, HK multi-tool, lock, and Soft Tactical Case.

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.


Condition: New In Box
Brand: HECKLER & KOCH USA
Model: MR556A1
Caliber: 5.56x45 mm NATO
Item #: 989791252
UPC: 642230246454
Location: CO

Trades Accepted:


Shipping Notes: We do not ship/sell to Washington D.C. Or anywhere else where it is not legal to own this firearm. It is your responsibility to ensure that this gun is legal to own where you live. We will take a personal check but it will be held for up to 10 days to clear our bank before shipping. Most Items will ship within 2 business days of payment and receiving of FFL license for shipping We take VISA/MASTERCARD and Discover FOR NO EXTRA FEE, We will also take USPS Money Orders.

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SELLER: Cornerstone Arms (FFL Dealer)
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