H&K MR556 A4 Pistol 5.56NATO 11″ Barrel 30+1

Description

The H&K MR556 A4 Pistol is the latest evolution of the civilian version of the legendary HK416 rifle, widely recognized for its performance in the hands of elite military units across the globe. This semi-automatic pistol delivers the same “no compromise” standards that define Heckler & Koch firearms, combining military-grade engineering with user-focused refinements for civilian use. Chambered in 5.56 NATO, the MR556 A4 features a 11-inch cold hammer-forged barrel made from high-grade cannon steel, offering exceptional durability, precision, and a 1:7” twist rate ideal for stabilizing a wide range of bullet weights. Unlike traditional direct impingement systems, the MR556 uses HK’s proven short-stroke gas piston system, which keeps carbon fouling and excess heat out of the receiver. This results in cleaner, cooler, and more reliable operation, especially under extended firing sessions or adverse conditions.

A 10-inch M-LOK handguard provides ample rail space for mounting lights, grips, or other accessories, while the adjustable gas regulator lets users fine-tune the pistol for optimal performance, whether suppressed or unsuppressed. Fully ambidextrous controls including the safety selector, magazine release, and bolt release make the pistol highly adaptable for both left- and right-handed shooters. The updated A4 version features a lighter overall weight and a slimmer profile for better handling and maneuverability. For shooters who demand premium build quality, exceptional reliability, and combat-proven performance in a civilian-legal pistol, the H&K MR556 A4 Pistol stands as one of the most capable and respected AR-platform rifles on the market today.

FEATURES

• HK short-stroke gas piston system prevents hot gases from entering the receiver, offering cleaner, cooler, and more reliable operation compared to direct impingement systems

• 11″ match-grade cold hammer-forged barrel for exceptional accuracy and longevity

• Suppressor-ready with concentric 1/2×28 threads for secure and aligned muzzle device mounting

• HK416 two-position adjustable gas block optimized for suppressed and unsuppressed use

• Continuous Picatinny rail between the upper receiver and handguard for uninterrupted optic mounting

• Lightweight 10″ M-LOK handguard with integrated ambidextrous QD sling swivel sockets

• Updated angled magazine well designed for improved feeding and faster reloads

• Fully ambidextrous controls, including safety selector, magazine release, and bolt release

• Ambidextrous safety selector with a short 45-degree throw for quicker engagement

• Ambidextrous QD end plate for flexible sling attachment options

• Two-stage trigger with a crisp 4.5–5.6 lb pull for improved control and precision

SPECIFICATIONS

• Manufacturer: Heckler & Koch
• Model: MR556 A4 Pistol
• MPN: 81001050
• UPC: 642230269439
• Caliber/Gauge: 5.56 NATO
• Capacity: 30+1
• Sights: N/A, Optics Ready
• Barrel Length: 11″
• Barrel Type: Cold Hammer Forged Steel, 1:7 RH Twist, 6 Grooves
• Weight: 6.61 lbs
• Overall Length: 26.5″
• Finish: Black
• Grip/Stock: HK USA Enhanced Pistol Grip

WHAT’S IN THE BOX

• H&K MR556 A4 Pistol 5.56NATO Tactical Semi Auto Pistol
• (1) 30 Round Magazine
• H&K Tool
• Cable Lock
• Owners Manual
• H&K Case