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Buy HK MR556 A4 16.5"
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Home Rifles Buy HK MR556 A4 16.5″ Rifle | Civilian HK416 Platform
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Buy HK MR556 A4 16.5″ Rifle | Civilian HK416 Platform

$3,500.00

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Category: Rifles Tags: adjustable gas block ar15, ambidextrous ar15, Buy HK MR556 A4, hk mr556 a4 16.5, hk reliability, hk416 civilian rifle, mr556 a4 rifle, nato 5.56 rifle, piston ar15 for sale, premium ar15, short stroke gas piston ar, tactical rifle
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Description

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.

  • Fully Ambidextrous Controls: Including selector, magazine release, and bolt release.

  • Lighter & Slimmer Profile: Redesigned for better balance and handling.

  • 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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