Heckler & Koch MR556A4 .223 REM/5.56 NATO

The Heckler & Koch MR556A4 in .223 REM/5.56 NATO is a purpose-built firearm suitable for range work and precision handling. Designed to deliver consistent operation in demanding conditions, it combines a short-stroke gas piston system with proven HK engineering. This configuration is appropriate for shooters seeking reliability and control during extended use.

The MR556A4 presents a durable, gray Cerakote finish and an 11" barrel that supports compact handling without sacrificing stability. Ergonomic controls and a collapsible/folding stock pair with an HK-style enhanced grip to provide a secure, adjustable interface for the shooter. The HK416-pattern upper and an M-LOK handguard provide modern accessory compatibility and a familiar platform layout.

Key Specifications

• The action is Semi-Auto.
• The caliber/gauge is .223 REM/5.56 NATO.
• The barrel length is 11".
• The capacity is 10 + 1.
• The weight is 6.61 lbs..
• The finish is Gray Cerakote.
• The firearm uses a Short Stroke Gas Piston operating system.
• The handguard is M-LOK Handguard for accessory mounting.
• The receiver is a Fully Ambidextrous Lower.
• The NFA thread pattern is 1/2x28.

Buy the Heckler & Koch MR556A4 .223 REM/5.56 NATO online today to add a compact, dependable platform to your collection with modern ergonomics and accessory compatibility.