The MR556A1 Upper Receiver Kit comprises an entire upper receiver and barrel assembly and bolt carrier as well as buffer and spring, allowing the most premium 5.56 millimeter AR-style rifles to be retrofitted with the pusher rod system of HK. Its upper receiver Kit is the heart part of HK 5.56 millimeter gas piston-operating system. It utilizes a piston and an operational solid "pusher" rod instead that of the tube for gas commonly found in AR15/M16/M4-style guns.
The identical operating system is utilized in the battle-tested 5.56 millimeter HK416 and also G36, XM8, G36, XM8, HK417 and many other Heckler and Koch arms. This MR556A1 Lower Receiver Kit is made to be completely adaptable to all top-quality AR-style guns, by simply connecting it onto any AR lower receiver with the usual takedown pins.
Because of the reduced size of HK buffer spring and HK (action) buffer springs The parts are unable to work with fixed stock AR rifles. Installing MIL-SPEC Hammers in lower receivers is necessary for a reliable operation. In addition, the MR556A1 Upper Receiver Kit cannot be used on lower receivers equipped with completely automatic or selective fire mechanisms.
However this HK416 Lower Receiver Kit (available to law enforcement personnel) is specifically designed to work using fully automated and selective fire lower receivers.
The HK piston-driven operating system eliminates virtually all the problems associated with Direct impingement gas devices as hot carbon fouling and waste gas do not get into the receiver's area. This is the exact aspect that has been crucial to the success that is the case with HK416 rifles that are used by the top police and military customers.
It is designed to work with a variety of high-quality 5.56 45 mm rounds This MR556A1 upper Receiver Kit makes use of an C.I.P. chamber with dimensions (a chamber with dimensions that are specified in the Commission Internationale Permanente). The MR556A1 can also be used with the best high-quality Caliber .223 Remington ammunition.
This MR556A1 upper Receiver Kit is produced in the USA with American and German manufactured components. Its Upper Receiver Kit utilizes a German-made barrel made by Heckler & Koch's famed cold hammer forging process. High-quality steel is utilized in this exclusive manufacturing process to create an item that has high accuracy and a longevity of service.
Unchromed 16.5-inch barrel is fitted with an internal profile that includes six grooves and lands with an 1 in 7 inches (178 millimeters) twist. It's additionally slightly "swagged" and has a lower internal diameter on the muzzle end than at the chamber end. This has an impact on the accuracy of bullets and their velocity. A heavy, thick contour can also be a factor in its high accuracy.
This Upper Receiver Kit also comes with an HK Free Floating Rail System (FFRS) handguard that has 4 MIL-STD-1913 "Picatinny" rails. This high-quality handguard made of alloy permits all of the latest accessories, lights, sights and aimers that are used on M4/M16-type arms , to be mounted. This HK rail system is able to be removed and installed using simple tools , and then is reinstalled at zero.
This Upper Receiver Kit comes with an Picatinny rail built into the top of the upper receiver to mount opticals as well as mechanical sights.
Part Number. 81000584, UPC 642230262607 - MR556 Upper Receiver Kit - includes bolt buffer, buffer spring M-LOK handguard for rifle length and 16.5"' barrel assembly with medium contour MSRP $2,069
HK MR556 Upper kit includes:
Complete MR556 Upper Barrel/Receiver Assembly--- HK 16.5 inches cold-hammer forge barrel upper receiver assisted by forward, an extended charger handle with a convertible option, MLOK handguard
- Complete MR556 Bolt Group Assembly
- Tungsten Filled Hong Proprietary Buffer
- Proprietary Buffer HK (Action) Spring
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