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Product Summary

A direct descendant 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. It uses many of the same assemblies and accessories 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. It features a German-made barrel produced by Heckler & Koc'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. 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.

Features:

- HK proprietary gas piston operating system
- HK Free Floating Rail System (FFRS) handguard has four MIL-STD-1913 Picatinny rails
- Picantinny rail machined into the top of its upper receiver
- German-made barrel produced by Heckler & Koch’s famous cold hammer forging process
- 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
- A precise enhanced two-stage trigger adds significantly to the accuracy of the MR5556A1 and an extended latch charging handle makes operating the rifle with a telescopic sight easier

Specifications:

- Action: Semi-Auto
- Caliber: 5.56 NATO/.233 Remington
- Capacity: 30rd
- Barrel: 16.5" (1:7) with Flash Suppressor
- Sights: Diopter Front and Rear
- Upper Receiver: Aluminum Black
- Lower Receiver: Aluminum Black
- Stock: 6-Position Synthetic Black
- Grip: Synthetic Black
- Handguard: HK Free Floating Rail System Black
- Fixed Buttstock
- Trigger Pull: 7.64 lbs
- Length: 37.68"
- Weight: 8.6 lbs.

Caliber Dictionary

The Below Information Has Been Provided From Our Gun Caliber Dictionary And Is Meant For Informational Purposes Only. It Is Not Intended to Describe The Unique Specifications For This Ammunition.
The 5.56X45mm NATO cartridge was designed by James Sullivan, a member of Eugene Stoner's engineering team that developed both the M16 rifle and its original cartridge. The 5.56X45mm NATO was adopted by the U.S. military in 1964 and by NATO in 1980. With bullet diameter of .224-inch, the original M193 military cartridge used a 55-grain bullet at 3250 fps; the current M855A1 cartridge, developed by FN, uses a 62.5-grain bullet at 3020 fps, offering greater range and better penetration. The civilian version of the 5.56X45mm is 223 Remington; the cartridges are dimensionally identical but military chamber dimensions and specifications for military brass are different. It is considered safe to use 223 Remington ammo in a 5.56X45MM NATO chamber, but not a good idea to use 5.56X45mm ammo in a rifle specifically chambered for the 223 Remington. Although the stopping power of .22-caliber bullets remains controversial the 5.56X45mm has served well in now multiple generations of M16 rifles. — Craig Boddington

Specifications
Specification   Value
Quantity   1
     
MFG NO    MR556FBA1
SKU    11135925
UPC    642230253773
Manufacturer
Heckler & Koch
Phone:   706-568-1906
Email:  
Website:   http://www.hk-usa.com
Address:   5675 Transport Blvd

Columbus, GA 31907
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