GunsAmerica

Quick Look

The HK MR556 A4 is a semi-automatic rifle derived from the renowned HK416 platform, developed by Heckler & Koch. Designed for reliability and modularity, it offers users high performance in various tactical and sporting roles. It enjoys strong popularity among enthusiasts seeking a durable AR-style rifle with precision engineering.

Why It's a Top Choice

Proven HK short-stroke piston system for enhanced reliability
Modular design allows customization with accessories
High-quality construction ensures long-term durability
Precision accuracy suitable for tactical and competition use
Compatible with standard AR-15 magazines

Key Variants

HK MR556A2

A versatile model balancing barrel length and weight for general purpose use.

HK MR556A1

Ideal for users seeking a compact rifle option without sacrificing reliability.

Competitor Comparison Table

Feature	Hk Mr556 A4	Colt M4	Daniel Defense DDM4
MSRP	$2,500+	$1,200+	$1,800+
Capacity/Size	30 rounds / 16\" barrel	30 rounds / 14.5-16\" barrel	30 rounds / 16\" barrel
Weight	7.9 lbs	6.5-7 lbs	7.0 lbs
Optics-Ready	Yes, Picatinny rail	Yes, various rail options	Yes, integral rail
Trigger Type	Single-stage	Single- or two-stage	Single-stage
Notable Pro	Reliable piston system	Proven service record	High-quality barrel
Notable Con	Higher price point	Direct impingement system	Weight above average

Best Use Cases

Tactical and law enforcement duty
Competition shooting
Home and self-defense
Range training and practice
Collection and military enthusiasts

FAQs

Can I use standard AR-15 magazines with the HK MR556 A4?

Yes, the HK MR556 A4 is compatible with standard AR-15 magazines chambered in 5.56 NATO.

What trigger type does the HK MR556 A4 feature?

It uses a single-stage trigger designed for a crisp and consistent pull suitable for tactical use.

How does the HK MR556 A4 differ from the Colt M4?

The MR556 A4 uses a short-stroke gas piston system, offering increased reliability over the Colt M4's direct impingement system.

HK MR556 A4 for Sale