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 |
Frequently Asked Questions About This Product
Why buy Heckler and Koch MR556 A4 Patriot Brown 5.56 16.5" Barrel 30-Rounds from Miami Shooters Supply?
We’re a trusted firearms dealer offering fast shipping, competitive pricing, and 100% compliance with U.S. federal firearm laws. All orders ship from our licensed facility with full tracking and expert customer service.
Where can I buy Heckler and Koch MR556 A4 Patriot Brown 5.56 16.5" Barrel 30-Rounds?
You can purchase this item directly on our website and have it shipped to your local FFL dealer. You can also visit us in-store in Miami, Florida.
Is Heckler and Koch MR556 A4 Patriot Brown 5.56 16.5" Barrel 30-Rounds available now?
Availability is shown live on this page. If the “Add to Cart” button is visible, this item is currently in stock and ready to ship.
What category does this product belong to?
This product is listed under: Modern Sporting Rifles, New Arrivals.
What tags or features does this product have?
Key features and tags for this product include: Modern Sporting Rifles, New Arrivals.
Is this product legal in my state?
It is your responsibility to ensure this item is legal in your state or locality. We ship only to valid FFL dealers in compliance with U.S. laws. Always check your local regulations.
FFL Transfer & Firearms Laws for Heckler and Koch MR556 A4 Patriot Brown 5.56 16.5" Barrel 30-Rounds
All firearms, including the Heckler and Koch MR556 A4 Patriot Brown 5.56 16.5" Barrel 30-Rounds, must be shipped to a licensed Federal Firearms License (FFL) dealer. You will be required to complete a background check and any necessary paperwork before taking possession.
How It Works
- Place your order online.
- Provide your preferred FFL dealer information.
- We ship the firearm directly to your FFL.
- You complete the background check and pickup at the FFL.
Legal Compliance
We comply with all federal and state firearm laws. It is your responsibility to ensure the Heckler and Koch MR556 A4 Patriot Brown 5.56 16.5" Barrel 30-Rounds is legal in your state. Some states may have restrictions on certain firearm models or features.
Helpful Resources
Need assistance? Contact our Miami store for help with FFL transfers and firearm compliance.
