Heckler and Koch MR556 A4 Pistol Gray 5.56 / .223 Rem 11 Barrel 30-Rounds

Overview

Heckler and Koch MR556 A4 Features The Heckler and Koch MR556 A4 is built on the proven short stroke gas piston operating system derived from the HK416 one of the most battle-tested and widely fielded military rifles in the world delivering the reliable cycling and reduced fouling that piston-driven platforms are known for in a compact 11 barreled pistol configuration chambered in .223 Rem / 5.56 NATO. The 1-in-7 twist rate barrel is threaded at 1/2x28 for direct suppressor and muzzle device attachment and the piston system s reduced heat transfer to the bolt carrier group makes the MR556 A4 a particularly capable foundation for suppressed builds where thermal management is a critical concern. For tactical shooters and serious builders who want the HK416 s piston reliability in a compact pistol format with a threaded barrel and Gray Cerakote durability the Heckler and Koch MR556 A4 is engineered to deliver. The fully ambidextrous lower receiver supports convenient and intuitive operation for both right and left-handed shooters with the ambidextrous safety lever providing consistent and accessible control regardless of the shooter s dominant hand. The HK416 upper receiver pairs with a free-floating M-LOK handguard that provides extensive accessory mounting real estate for lights lasers grips and bipods while keeping the handguard profile slim and comfortable for sustained use. The enhanced ergonomic HK grip provides a comfortable and consistent hand position that complements the platform s natural balance and the Gray Cerakote finish provides durable corrosion and wear resistance through hard use in demanding environments. The Heckler and Koch MR556 A4 reflects HK s commitment to bringing military-grade engineering to the civilian and professional market in configurations that serve both tactical and recreational applications without compromising the quality standards that define the HK416 lineage. At 6.61 lbs and 26.5 overall length the MR556 A4 is compact and maneuverable enough for close-quarters configurations while retaining the weight and balance that make the platform stable and controllable through sustained fire. For tactical shooters serious builders and HK enthusiasts who want a piston-driven .223 Rem / 5.56 NATO pistol with HK416 DNA M-LOK modularity and a threaded barrel in a durable Gray Cerakote finish the Heckler and Koch MR556 A4 is available now at GrabAGun. Heckler and Koch MR556 A4 Specifications Manufacturer: Heckler and Koch Model: MR556 A4 Type: Semi-Automatic Pistol Caliber: .223 Rem / 5.56 NATO Color: Gray Cerakote Finish: Gray Cerakote Weight: 6.61 lbs Barrel Length: 11 Barrel Twist: 1-in-7 Muzzle Thread: 1/2x28 Capacity: 30+1 Action: Semi-Auto Operating System: Short Stroke Gas Piston Upper Receiver: HK416 Lower Receiver: Fully Ambidextrous Handguard: M-LOK Grip: HK Enhanced Ergonomic Safety: Ambidextrous Safety Lever Sights: None Included Overall Length: 26.5 Magazines Included: 1 Available At: GrabAGun