H&K MR556 A4 SBR 5.56mm 30rd 11" Threaded Barrel NFA Item | 81001048
Experience elite German engineering in a compact package with the Heckler & Koch MR556 A4 SBR. This factory-configured Short-Barreled Rifle features an 11-inch threaded barrel and is chambered in 5.56x45mm NATO. Built on the proven MR556 platform, the A4 model delivers exceptional reliability, accuracy, and ergonomics in a highly maneuverable package. The MR556 A4 SBR is designed for professionals and serious enthusiasts who require the performance of a full-size rifle in a much shorter overall length. With its 30-round magazine capacity, threaded barrel for suppressor use, and premium components, this NFA-registered firearm represents the pinnacle of modern short-barreled rifle design.
Important Notice: This is an NFA (National Firearms Act) item. The H&K MR556 A4 SBR requires proper ATF registration, payment of the $200 NFA tax, and compliance with all federal, state, and local laws. Transfer must be completed through a licensed Class 3 / SOT dealer.
Why Choose the H&K MR556 A4 SBR?
The Heckler & Koch MR556 A4 SBR (81001048) offers the perfect combination of compact size and full-powered 5.56mm performance. The 11-inch barrel significantly reduces overall length compared to standard 16-inch rifles, making it ideal for close-quarters work, vehicle operations, and situations where maneuverability is critical. Despite its short barrel, the MR556 A4 maintains the legendary reliability and accuracy that Heckler & Koch is known for. The rifle features a cold hammer-forged barrel, a crisp trigger, and an ambidextrous control layout that enhances usability for both right- and left-handed shooters. The threaded 11-inch barrel allows for the attachment of suppressors, flash hiders, or other muzzle devices, further increasing its versatility in tactical and recreational applications.
Key Features of the H&K MR556 A4 SBR
- 11-Inch Threaded Barrel – Compact length with 1/2x28 threading for suppressors and muzzle devices.
- 5.56x45mm NATO – Chambered in the most widely used intermediate cartridge in the world.
- 30-Round Magazine Capacity – Compatible with standard AR-15 magazines.
- Cold Hammer-Forged Barrel – Exceptional accuracy and barrel life.
- Ambidextrous Controls – Safety selector and bolt catch for left- and right-handed shooters.
- Factory SBR Configuration – Legally registered short-barreled rifle from the manufacturer.
- Model Number: 81001048
- UPC: 642230274112
Compact Size with Full Rifle Performance
The H&K MR556 A4 SBR delivers the handling characteristics of a submachine gun while retaining the terminal ballistics and effective range of a 5.56mm rifle. The 11-inch barrel reduces overall length dramatically compared to standard carbines, making it easier to maneuver in confined spaces, vehicles, or when wearing body armor. Despite the shorter barrel, the MR556 A4 maintains excellent accuracy and reliability thanks to Heckler & Koch’s precision manufacturing standards and the use of a cold hammer-forged barrel. This makes it an outstanding choice for tactical teams, competition shooters, and enthusiasts who prioritize compactness without sacrificing performance.
Premium Engineering and Reliability
Heckler & Koch is renowned worldwide for producing some of the most reliable and durable firearms available. The MR556 A4 SBR continues this tradition with a robust gas-operated system, high-quality materials, and meticulous attention to detail. The rifle features a free-floating handguard, a crisp single-stage trigger, and an ergonomic pistol grip that enhances control during rapid fire. The ambidextrous safety selector and bolt release make the rifle highly adaptable for different users and shooting positions. Every component is engineered to meet the demanding standards expected from professional-grade firearms.
Product Specifications – H&K MR556 A4 SBR
- Brand: Heckler & Koch (H&K)
- Model: MR556 A4 SBR
- Part Number: 81001048
- Caliber: 5.56x45mm NATO
- Barrel Length: 11 inches (Threaded 1/2x28)
- Overall Length: Approximately 27.5 – 30.5 inches (varies with stock position)
- Capacity: 30 Rounds
- Action: Semi-Automatic, Gas Operated
- Receiver: Aluminum with integrated rail system
- Stock: Adjustable
- Classification: NFA Item – Short-Barreled Rifle (SBR)
- UPC: 642230274112
- Best For: Tactical applications, close-quarters work, suppressed shooting, professional use
Threaded Barrel for Suppressor Use
The 11-inch barrel on the H&K MR556 A4 SBR is threaded 1/2x28, allowing for the easy attachment of suppressors, flash hiders, and other muzzle devices. When paired with a quality suppressor, this SBR becomes an exceptionally quiet and controllable platform, making it ideal for training, competition, or tactical scenarios where reduced signature is beneficial. The short barrel also helps minimize overall length when a suppressor is attached, preserving the compact nature of the rifle.
Why Professionals Choose the H&K MR556 A4 SBR
The Heckler & Koch MR556 A4 SBR 5.56mm (81001048) is trusted by professionals who require a compact, reliable, and accurate short-barreled rifle. Its factory SBR configuration eliminates the need for aftermarket modifications and ATF paperwork associated with converting a standard rifle. The combination of an 11-inch threaded barrel, 30-round capacity, ambidextrous controls, and legendary H&K reliability makes this rifle a top choice for those operating in confined spaces or requiring maximum maneuverability. Whether used for professional applications, competitive shooting, or as a high-end collector’s piece, the MR556 A4 SBR delivers the performance and quality expected from Heckler & Koch. Its compact size, suppressor-ready design, and proven track record have made it a standout option in the short-barreled rifle category.
Acquire the ultimate compact 5.56mm platform with the Heckler & Koch MR556 A4 SBR (81001048). This factory NFA-registered Short-Barreled Rifle features an 11-inch threaded barrel, 30-round capacity, and premium German engineering for superior performance in a highly maneuverable package.
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