This is a complete Heckler & Koch MR556 upper receiver assembly, configured with a 16-inch cold hammer-forged barrel. The barrel features a 1:7 twist rate and is free-floated within the factory MLOK rail handguard for consistent accuracy. The upper receiver retains the factory anodized finish and utilizes HK’s short-stroke gas piston system for reliable operation and reduced fouling compared to direct impingement systems.

Included with this upper is the correct MR-marked bolt carrier group and factory charging handle. The upper is in unfired condition but shows slight cosmetic handling marks on the exterior of the handguard.

Specifications:

• Model: Heckler & Koch MR556 upper assembly

• Barrel length: 16 inches

• Barrel profile: Cold hammer-forged, free-floated

• Twist rate: 1:7

• Gas system: Short-stroke piston

• Handguard: Factory MLOK rail

• Bolt carrier group: HK MR-marked included

• Charging handle: HK MR-marked included

• Finish: Factory anodized