HK MR556 A4 5.56 NATO 16.5" Threaded Barrel M-LOK Rifle 30+1 Ambidextrous

This rifle blends a battle-proven design with premium engineering built for accuracy and hard use.

The HK MR556A4 5.56 NATO shows a clean black finish with a full-length Picatinny top rail. The rifle carries a rugged look shaped by HK’s military heritage. The M-LOK handguard adds a modern design that stays slim while allowing strong accessory support. The black synthetic stock completes the rifle with simple, durable lines. The HK MR556A4 5.56 NATO uses a 16.50 inch threaded barrel and a 30+1 capacity. The 5.56 NATO caliber gives light recoil and consistent accuracy. The HK gas piston system keeps the action clean and supports smooth cycling in tough conditions. This 5.56 rifle for sale delivers reliable performance from close range to extended training sessions. The threaded barrel allows easy setup for flash hiders, brakes, or suppressors. The Picatinny rail gives room for optics, lights, or irons. The M-LOK handguard stays cool and offers flexible mounting points. The deep black finish protects the rifle under long use. Every feature reflects HK’s focus on durability and high-end build quality. The 6-position stock allows fast length adjustments for comfort. The ambidextrous controls support left- or right-handed shooters. The grip and stock design keep the rifle stable during long shooting days. The balanced feel helps you manage recoil and stay accurate during drills or field use. The HK MR556A4 5.56 NATO gives shooters premium value with its piston system, threaded barrel, and ambidextrous layout. Many buyers search for the best price on HK MR556A4 or want to buy HK 5.56 rifles online because of their unmatched build quality. This HK rifle offers accuracy, toughness, and trusted performance. You can find this model at One Stop Firearms in Mesa AZ where many shooters in Mesa Arizona choose HK rifles for elite reliability.

Key Specifications

• Model: HK MR556A4
• Caliber: 5.56x45mm NATO
• Capacity: 30+1
• Barrel Length: 16.50 in.
• Barrel Type: Threaded
• Handguard: M-LOK
• Rail: Full-Length Picatinny
• Stock: 6-Position Black Synthetic
• Controls: Ambidextrous
• Finish: Black
• Action: Semi-Auto
• Operating System: HK Short-Stroke Gas Piston

FAQ

Q: What makes the MR556A4 different from standard AR-15 rifles? A: It uses HK’s piston system for cleaner operation and improved durability. Q: Is the barrel suppressor-ready? A: Yes. The 16.5" barrel is threaded for suppressors or muzzle devices. Q: Are the controls ambidextrous? A: Yes. The safety and other controls support both left- and right-handed shooters.