Buy HK MR556 Online
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.
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.
What’s in the Box
MR556-A1 5.56x45mm Rifle
(1) 30-Round Magazine
Troy Industries Folding Battle Sights
H&K Multi-Tool
H&K Tactical Range Bag
Cable Lock
Owner’s Manual
Firearm Specifications
Manufacturer: H&K
Model: MR556A1
Caliber: 5.56x45mm
Barrel Length: 16.5″
Overall Length: 33.9-37.68″
Trigger Pull: 7.64 lbs.
Barrel Profile: 6 Lands & Grooves; 1:7″ RH
Sight Radius: 14.6″
Width: 3.07″
Height: 9.45″
Trigger Pull: 7.64 lbs.
Sights: Troy Industries Folding Battle Sights
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