Home / AR Rifles / Heckler and Koch / Heckler and Koch MR556 A4 Patriot Brown 5.56 16.5 Barrel 30-Rounds
Heckler and Koch MR556 A4 Patriot Brown 5.56 16.5 Barrel 30-Rounds

Heckler and Koch MR556 A4 Patriot Brown 5.56 16.5 Barrel 30-Rounds

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Updated
Jun 18, 2026

Specifications

Caliber
Model
Series
A4
MPN
81001203
UPC
642230271074

Description

HK MR556 A4 Features The MR556 A4 is equipped with a cold hammer-forged barrel made from high-quality steel ensuring exceptional barrel life and consistent accuracy. The 1:7" twist rate stabilizes a wide range of bullet weights while the threaded muzzle provides compatibility with muzzle devices or suppressors. The 6-position adjustable stock and ambidextrous safety lever enhance control and comfort for both right- and left-handed shooters. Its free-floating M-LOK handguard reduces weight and heat transfer while providing ample space for customization. The trigger pull is set between 4.5 to 5.6 pounds giving users a crisp and responsive shooting experience. Whether used for tactical applications precision shooting or sporting use the MR556 A4 delivers performance in every category. HK MR556 A4 Specifications Brand: HK Model: MR556 Series: A4 Category: Tactical Rifles Caliber: 5.56x45mm Action: Semi-Auto Operating System: Gas Piston Barrel Length: 16.5 Barrel Description: Threaded Barrel Material: Steel Barrel Finish: Black Twist Rate: 1:7 Grooves: 6 Thread Pattern: 5/8x24 Muzzle: Threaded Receiver Description: Picatinny Rail Receiver Finish: Patriot Brown Handguards: M-LOK Handguard Finish: Black Sights: None Stock Description: 6 Position Stock Material: Synthetic Stock Finish: Black Overall Length: 36.5 Height: 7.5 Width: 3.07 Weight: 7.67 lbs Trigger Pull Weight: 4.50-5.60 lbs Safety: Ambidextrous Safety Lever Capacity: 30 + 1 Max Capacity: 30 Hand: Ambidextrous
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