HK MR556 A4 223 Remington/5.56x45mm, 11″ Threaded Barrel, Black, M-Lok Handguard, 10rd

HK MR556 A4 – Premium 5.56x45mm Pistol with Unmatched German Engineering

The HK MR556 A4 is a high-performance semi-automatic pistol chambered in 5.56x45mm NATO / .223 Remington, delivering military-grade reliability in a compact, maneuverable package. Built by Heckler & Koch, this elite firearm features an 11″ cold hammer-forged threaded barrel (1/2×28 thread pitch) for exceptional accuracy and suppressor compatibility. Designed for professional use, the MR556 A4 is ideal for tactical operators, home defense, and precision shooters who demand the best.

Constructed with a forged aluminum receiver and a rugged M-LOK handguard, this HK pistol offers superior durability while remaining lightweight. The free-floating M-LOK rail allows for effortless accessory mounting, including lights, lasers, and grips, enhancing versatility in any scenario. The short-stroke gas piston system ensures reliable cycling with reduced recoil and minimal fouling, even in harsh conditions.

The MR556 A4 includes a 10-round magazine (compatible with STANAG mags) and features ambidextrous controls, a non-reciprocating charging handle, and an HK-proprietary rail system for optics mounting. The adjustable two-stage trigger provides a crisp, clean break for enhanced shot placement.

Whether for duty, competition, or personal defense, the HK MR556 A4 combines German precision with battle-proven performance. Its compact 11″ barrel, suppressor-ready design, and rugged M-LOK handguard make it a top-tier choice for shooters who refuse to compromise.

Key Features:

• Caliber: 5.56x45mm NATO / .223 Remington
• Barrel: 11″ cold hammer-forged, threaded (1/2×28)
• Handguard: Free-float M-LOK for accessory mounting
• Receiver: Forged aluminum for maximum durability
• Magazine: 10-round (STANAG compatible)
• Operating System: Short-stroke gas piston
• Controls: Ambidextrous safety & magazine release

Experience the pinnacle of firearm engineering with the HK MR556 A4—where precision, reliability, and tactical adaptability meet.