HK

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 manufactured in the USA using American and German made components. The MR556A1 uses many of the same assemblies and accessories originally developed for the HK416.

• Type: Rifle: Semi Automatic
• Model Series: MR556
• Caliber/Gauge: 5.56 NATO
• Capacity: 30+1
• Barrel Length: 16.5 in.
• Minimum/Overall Length: 37.68 in.
• Safety: Manual Safety
• Frame Finish: Black
• Firearm Stock: Black Synthetic Adjustable
• Features: M-LOK Handguard
• Finish: Black
• Magazine Count: 1.000
• Operating System: Gas Piston
• Firing System: Internal Hammer
• Scope Base: Picatinny Rail
• Trigger: 2-Stage
• Magazine Type: Double Stack Magazine
• Barrel Configuration: Single
• Barrel Description: Cold Hammer-forged
• Muzzle: Flash Hider
• Threaded Barrel: Yes
• Rifled Barrel: Yes
• Forend Rail: Free Float 4 Quadrant Rail