Heckler & Koch MR556 A4 5.56mm Semi-Automatic Rifle – 11″ Barrel, 30rd Magazine, Black

The Heckler & Koch MR556 A4 represents the pinnacle of commercial AR-platform engineering, built on the legendary HK416 lineage and refined for civilian ownership without sacrificing a single degree of performance. Chambered in 5.56mm NATO with an 11-inch barrel and a 30-round magazine, this is one of the most capable and meticulously engineered semi-automatic rifles available on the market today.

At the heart of the MR556 A4 is HK’s proprietary short-stroke gas piston operating system — the same technology trusted by elite military and law enforcement units worldwide. Unlike traditional direct-impingement ARs, the piston system keeps hot carbon fouling out of the action, resulting in a cooler-running, cleaner, and more reliable platform that demands less maintenance and places less wear on internal components over time.

The A4 variant introduces an adjustable gas regulator, allowing shooters to precisely tune the action for suppressed or unsuppressed operation — a critical feature for serious tactically-minded users. Fully ambidextrous controls ensure natural, efficient manipulation for both left- and right-handed shooters, while the slimmer profile and optimized weight distribution of 6.61 lbs contribute to a more agile and comfortable handling experience in any environment.

Additional specifications include:
– Caliber: 5.56mm NATO
– Capacity: 30 rounds
– Overall Length: 26.5 in
– Width: 3.07 in
– Height: 7.5 in
– Barrel Length: 11 in
– Weight: 6.61 lb
– Trigger Pull: 4.5 – 5.6 lb
– Barrel: 6 lands & grooves, right-hand twist, 1:7 in
– Sights: Optics-ready
– Color: Black

Optics-ready out of the box, the MR556 A4 is ready to accept your preferred optic for a fully customized setup tailored to your application. Whether you’re a competitive shooter, a serious collector, or someone who simply refuses to compromise on quality, the HK MR556 A4 stands in a class of its own.

Order online today at VanTon Arms and experience fast nationwide shipping on one of the most sought-after and hard-to-find rifles in the HK lineup. At $3,749.00, this is your opportunity to own a no-compromise, top-tier HK platform at a competitive price.