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Posted: Monday, February 19, 2018 8:04 AM

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MR556A1-SD
The new HK suppressed MR556A1-SD is equipped with a cutting edge next generation of suppressor technology from Operators Suppressor Systems Inc. (OSS). It is coupled with HK’s unique new Modular Rail System (MRS) to provide the shooter with a high performance integrated weapon system.

The modular rail system (MRS) for the MR556-SD allows the shooter to place individual rail components and accessories anywhere along the length of the seven free sides of the forearm using the slotted interface. HK has been working with OSS to develop the next generation of advanced suppressors for the HK MR series of rifles and carbines.

These suppressors are comprised of two modules, a Back Pressure Regulator (BPR) and a Signature Reduction Module (SRM)™. The BPR1425™ on the MR556A1-SD captures and controls expanding gases instead of simply trapping the gas with baffles. To further reduce the sound signature of the MR556 and eliminate flash, the OSS SRM4 module can be added to the end of the BPR1425.

Important Features of the MR556A1-SD

MODULAR RAIL SYSTEM (MRS)
Repeatable rail segment mounting in any position along the 14 inch forearm (9 inch MRS also available)
Self-captured rail segment hardware
Two integrated Quick Detachable (QD) sling attachment points just forward of the receiver
Optional positionable QD mount attachment
Octagon profile allows the OSS suppressor to be installed/removed with the rail in place
MRS provides more comfort to the shooter’s support hand
OSS SUPPRESSOR
Typical 18 dB reduction with the BPR module installed without SRM
Less than an inch of increased weapon length with just the BPR
Eliminates up to 95% of the back pressure created by traditional suppressors
Attenuates the noise signature without adversely affecting the operating system
Redirection of expanding gas within the BPR reduces felt recoil and muzzle rise
Greatly reduces weapon fouling
Little increase in bolt speed
Reduces component wear and overheating common to legacy suppressor designs
Reduction in back pressure greatly diminishes toxic gases expelled back at the shooter
Better weapon balance with over the barrel mounting of the BPR module
Typical sound reductions measured at the shooter’s ear with the BPR and SRM4 installed <139 dB
Components are designed to self-tighten during firing to prevent loosening
Little to no impact shift transitioning from just BPR to BPR and SRM
Typical MRTF (mean rounds to failure) 8000 rounds, semi-automatic
Internal parts on both the BPR and SRM can be replaced
The HK MR556A1-SD gives the shooter the same outstanding MR rifle performance with the added benefit of more ergonomic handling and noise comfort of the new MRS rail system and OSS advanced sound suppression.

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.

The MR556A1 rifle is priced at $3,295 (includes rifle, HK 30-round steel magazine, set of Troy Industries Micro mechanical sights, HK multi-tool,lock, and case).

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Price doesn't include a $25 background check fee, If you have a valid CCW issued after July 1st, 2011 then the fee can be waived.

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Davidson's Firearms
10890 S Eastern Ave
Suite 103
Henderson, NV 89052

702-456-6600.

Hours:
Tues - Friday : 9:00am to 5:30pm
Saturday : 10:00am to 5:00pm



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