H&K MR556 | 5.56 NATO | 16.5″ Tropentarn

The Heckler & Koch MR556 75th Anniversary Edition is a limited-production semi-automatic AR-style rifle finished in Tropentarn Cerakote and packaged with commemorative items and a custom hard case. It features a 16.5″ barrel and HK’s established piston-driven operating system intended to run cleaner under adverse conditions. An optic that pairs well and remains under $1,000 is the Vortex Strike Eagle 1-6×24, which provides a versatile low-power variable platform for both close and mid-range engagements.

Recommended applications for this model include target and competition shooting and carbine/tactical training; the rifle’s design emphasizes reliability and consistent performance in extended use.

Product Specifications

• The manufacturer and model are listed as Heckler & Koch MR556.
• The caliber is .223 Remington / 5.56 NATO.
• The barrel measures 16.5 inches for balanced handling.
• The action is Semi-Auto.
• The finish is a Tropentarn Cerakote application.
• The external color is specified as Tropentarn.
• The rifle weight is listed as 8.60 lbs..
• The fore-end features an M-LOK handguard.
• The grip material is Polymer with black furniture.
• The barrel uses a 1-in-7″ rate of twist.
• The package includes a custom-cut polymer hard case.
• Included commemoratives are a 75th Anniversary logo and a 75th Anniversary coin.
• The finish type is listed as Applied Finish.
• The UPC is 642230268463.

This 75th Anniversary MR556 pairs HK engineering with commemorative cosmetics and practical furniture. The Cerakote Tropentarn finish and custom case make it a distinct collector-friendly example of HK’s MR line while retaining the platform’s utility for serious range work and competition. Its piston-driven design and cold hammer-forged barrel construction are intended to deliver consistent performance during extended use.

Many owners and reviewers praise the MR556 for its reliable piston operation in adverse conditions and for the overall fit-and-finish and accuracy provided by the cold hammer-forged barrel.