H&K MR556 A4 5.56mm Pistol
The latest update from HK-USA to the commercial variant of the legendary HK416, the MR556 A4 and MR762 A4 represent an enhanced example of “no compromise” HK performance.
Its short stroke gas piston operating system does not impart hot carbon fouling back into the action, allowing the weapon to run longer, with less maintenance and with less wear on internal components than direct-impingement ARs. Its adjustable gas regulator allows the operator to tune the action specifically for suppressed or unsuppressed operation. While fully ambidextrous controls, lighter weight and a slimmer profile make the new A4 easier to operate, manipulate and employ.
HK MR556 A4 Pistol (Specifications)
- Manufactures Item Number: 81001050, UPC: 642230269439 (HK MR556 A4 Pistol – 30 Rd)
- Manufactures Item Number: 81001051, UPC: 642230269446 (HK MR556 A4 Pistol – 10 Rd – Compliant States)
- Caliber: 5.56 NATO
- Length: 26.5 inches
- Barrel Length: 11 inches Hammer forged Cannon Grade Steel Barrel (Life Time Warranty on Barrel Life)
- Barrel Twist: 1:7 inches, 6 lands/grooves
- Operating System: Short Stroke Gas Piston – Adjustable two position gas black
- Controls: Full Ambidextrious
- Sights: No Sights, Optics Ready Picatinny Rail
- Trigger Pull: 4.5 – 5.6 pounds
- Weight: 6.61 pounds
- Handguard: New M-LOK
- Stock: SB Tactical SBA5 Collapsible Brace
- Magazine: One 30 Round
FFL Transfer & Firearms Laws for HK MR556 A4 Pistol
All firearms, including the HK MR556 A4 Pistol, 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 HK MR556 A4 Pistol 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.
Frequently Asked Questions About This Product
Why buy HK MR556 A4 Pistol 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 HK MR556 A4 Pistol?
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 HK MR556 A4 Pistol 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: Heckler & Koch, New guns.
What tags or features does this product have?
Key features and tags for this product include: HK Rifles, new HK MR556 A4.
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.
| Model | HK MR556 A4 Pistol – 10 Round Mag – Compliant States, HK MR556 A4 Pistol – 30 Round Mag |
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FFL Transfer & Firearms Laws
All firearms, including the HK MR556 A4 Pistol, must be shipped to a licensed Federal Firearms License (FFL) dealer. A background check and any required local paperwork must be completed before you can take possession.
How It Works
- Place your order online.
- Send us your preferred local FFL dealer info.
- We ship the firearm to your FFL after verification.
- Complete background check and pick up from your dealer.
Legal Compliance
We comply with all U.S. firearm laws. It is your responsibility to ensure the HK MR556 A4 Pistol is legal in your state. Some states (e.g. CA, NY, NJ) have restrictions on magazine size or certain features.
Helpful Links
Need help? Contact our team — we’ll guide you through selecting a compliant firearm and the FFL transfer process.
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