Description
The Heckler & Koch MR556 A4 is the commercial MR-series update inspired by the HK416 platform, built around a short-stroke gas piston system and an adjustable gas regulator. This compact 11-inch configuration pairs a threaded barrel with an M-LOK handguard and a black anodized finish. Fully ambidextrous controls and a slim profile emphasize controllability and user ergonomics for compact duty, range use, and utility applications.
Key Specifications
Manufacturer: Heckler & Koch / H&K.
Model: MR556 A4.
Caliber: .223 Rem / 5.56 NATO.
Barrel length: 11 inches.
Barrel type: Threaded.
Action: Semi-Auto.
Weight: 6.61 lb.
Overall length: 26.50 inches.
Handguard: M-LOK.
Rate of twist: 1-in-7.
With its short-stroke piston operation and adjustable gas regulator, the MR556 A4 is designed for reduced maintenance and consistent performance in compact configurations. The combination of an 11-inch threaded barrel, M-LOK modularity, and ambidextrous ergonomics makes it a well-rounded option for shooters seeking a reliable, service-oriented platform for range work and compact utility roles.
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