Heckler & Koch MR556 A4 SBR 5.56mm Rifle
Heckler & Koch's short-stroke gas piston AR platform delivers legendary reliability with ambidextrous controls, adjustable gas regulator, and a compact profile. NFA regulated item.
The Heckler & Koch MR556 A4 SBR: Uncompromising Performance in a Compact Package
The MR556 A4 SBR represents Heckler & Koch's latest evolution of the commercial MR556 platform—a direct descendant of the legendary HK416 battle rifle. This is a rifle built on the principle of "no compromise" performance.
Operating System Advantage
The short-stroke gas piston operating system is the heart of this design. Unlike direct-impingement ARs that route hot carbon fouling back into the action, the piston system keeps your rifle running cooler and cleaner. This means:
- Longer service intervals between cleanings
- Less wear on internal components
- Greater reliability in extended shooting sessions
- Easier maintenance overall
Operator-Centric Design
The A4 incorporates fully ambidextrous controls, making it equally comfortable for left and right-handed shooters. The slimmer profile and lighter weight make the rifle easier to manipulate in tight quarters—whether you're training, competing, or working in confined spaces.
Tunable Performance
The adjustable gas regulator allows you to fine-tune the action for your specific needs. Running suppressed? Dial it in for optimal performance with a suppressor. Running unsuppressed? Adjust accordingly. This flexibility is a hallmark of professional-grade rifle design.
Important Legal Notice
This item is regulated under the National Firearms Act (NFA). It is your responsibility to ensure compliance with all applicable NFA regulations and local laws. Consult an attorney if you have questions about your specific situation.
