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: 5/8″x24
- 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
| Barrel Length | 16.5 |
|---|---|
| Caliber | 5.56 |
| Capacity | 30 |
| Condition | New in Box |
| Finish Per Color | Patriot Brown |
| Manufacturer | Heckler and Koch |
| Manufacturer Part Number | 81001203 |
| Model | MR556 A4 |
| Type | Modern Sporting Rifles |
| UPC | 642230271074 |
