HK MR556 A4 5.56x45mm 16.5" M-LOK Rifle Black 30+1

The HK MR556 A4 5.56x45mm Tactical Rifle is a premium semi-automatic rifle built for professional-grade performance, inspired by the legendary HK416. Featuring a 16.5" threaded barrel and advanced short-stroke gas piston operating system, the MR556 A4 offers superior reliability, reduced fouling, and extended service life. Whether for tactical deployment, range use, or home defense, this rifle delivers unmatched precision and rugged performance in all conditions.

Key Features

• Short-Stroke Gas Piston System: Keeps hot carbon out of the action, reducing wear and improving reliability over direct impingement systems.
• Adjustable Gas Regulator: Perfectly tune your rifle for suppressed or unsuppressed firing for smoother, consistent operation.
• Threaded 16.5” Barrel: Steel construction with a 1:7” twist rate for excellent accuracy and compatibility with a wide range of 5.56x45mm ammunition.
• M-LOK Handguard: Lightweight and modular, allowing secure attachment of accessories while maintaining a slim profile.
• Fully Ambidextrous Controls: Ambidextrous safety, mag release, and charging handle ensure intuitive operation for both left- and right-handed shooters.
• 6-Position Synthetic Stock: Offers quick adjustability for comfort and fit in a wide range of shooting stances and scenarios.
• Picatinny Rail System: Full-length top rail allows easy mounting of optics and backup iron sights (not included).
• Enhanced Durability: Built with high-grade materials and finishes including a black hardcoat anodized receiver and steel barrel for long-lasting use.

Specifications

• Brand: HK
• Model: MR556 A4
• Caliber: 5.56x45mm NATO
• Action: Semi-Auto
• Operating System: Short-Stroke Gas Piston
• Capacity: 30+1
• Barrel Length: 16.5"
• Barrel Type: Threaded, Steel
• Twist Rate: 1:7”
• Handguard: M-LOK
• Receiver: Picatinny Rail, Black Finish
• Stock: 6-Position Adjustable, Synthetic
• Safety: Ambidextrous Safety Lever
• Trigger Pull: 4.50–5.60 lbs
• Overall Length: 36.50"
• Height: 7.50"
• Width: 3.07"
• Weight: 7.67 lbs
• Thread Pattern: 5/8"x24
• Max Capacity: 30 Rounds
• Sights: None (Optics Ready)

Conclusion

• The HK MR556 A4 5.56x45mm Rifle is a top-tier tactical platform offering unmatched durability, modularity, and ambidextrous functionality. Ideal for both professional and civilian use, its piston-driven reliability, enhanced ergonomics, and high-performance components make it a standout in any setting. Whether you're looking for a rugged patrol rifle or a dependable home defense weapon, the MR556 A4 is ready for any mission.