Buy HK MR556 A4 16.5″: The Enhanced Civilian HK416
The HK MR556 A4 16.5″ represents the latest and most refined evolution of the legendary HK416 platform available to the commercial market. This is a true “no compromise” rifle, engineered to deliver the same legendary reliability, durability, and performance that defines its military counterpart. Chambered in 5.56x45mm NATO, the MR556 A4 is not just another AR—it is a purpose-built system designed to outperform and outlast direct-impingement designs. Buy the HK MR556 A4 16.5″ to own the pinnacle of piston-driven rifle technology.
Superior Piston-Driven Reliability
At the heart of the MR556 A4’s legendary performance is its short-stroke gas piston operating system. Unlike traditional AR-15s, this system prevents hot, carbon-fouled gas from being blown back into the rifle’s action and BCG. This critical design difference means the MR556 A4 runs cooler, cleaner, and with significantly less wear on internal components. The result is a rifle that requires less maintenance and delivers unfailing reliability over thousands of rounds.
The inclusion of an adjustable gas regulator further elevates its capability, allowing you to fine-tune the rifle’s operation for optimal performance with or without a suppressor.
Enhanced Ergonomics & Modern Features
The A4 generation introduces key ergonomic improvements, making it the most user-friendly MR556 to date.
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Fully Ambidextrous Controls: Including selector, magazine release, and bolt release.
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Lighter & Slimmer Profile: Redesigned for better balance and handling.
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Robust Free-Float Rail: Provides a stable 20.3-inch Picatinny top rail and ample M-LOK attachment points for optics and accessories.
HK MR556 A4 16.5″ Specifications
| Specification | Detail |
|---|---|
| Model | HK MR556 A4 |
| Caliber | 5.56x45mm NATO (.223 Remington) |
| Barrel Length | 16.5 inches |
| Barrel Twist | 1 in 7 inches, 6-Groove, Right-Hand Twist |
| Overall Length | 33.25 in. – 36.5 in. (Stock Adjusted) |
| Overall Height | 7.5 inches |
| Overall Width | 3.07 inches |
| Rail Length | 20.3 inches (Full-top Picatinny) |
| Weight (Unloaded) | 7.67 lbs |
| Magazine Weight | 0.20 lbs |
| Operating System | Short-Stroke Gas Piston |
| Gas System | User-Adjustable Regulator |
| Controls | Fully Ambidextrous |
| Magazine Capacity | Compatible with standard 30/20/10-round AR mags |
The Top-Tier Solution for Demanding Shooters
For the shooter who refuses to accept anything less than absolute reliability—whether for duty, home defense, or demanding recreational use—the MR556 A4 stands alone. It is engineered not to simply meet expectations but to redefine them, offering unmatched capability and uncompromising durability.
Experience the HK standard. Buy the HK MR556 A4 16.5″ rifle today.
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