HK MR762 A4 Complete Upper Receiver Assembly 7.62x51mm NATO 13" Cold Hammer Forged

The HK MR762 A4 is a complete upper receiver assembly from Heckler & Koch, representing the commercial evolution of the legendary HK417 battle rifle. This drop-in upper brings HK combat-proven performance to the AR-platform, chambered in 7.62x51mm NATO (.308 Winchester) and built around a 13" cold hammer forged steel barrel.

The barrel is manufactured using HK's signature cold hammer forging process, producing an exceptionally durable and accurate tube that delivers consistent performance round after round. The upper is finished in a non-reflective matte black anodized hard coat, and muzzle threads are cut to 5/8x24 for compatibility with a wide range of sound suppressors, muzzle brakes, and flash hiders.

Designed as the commercial counterpart to the HK417 used by military and law-enforcement units worldwide, the MR762 A4 upper assembly lets builders and existing MR762/AR-10-pattern lower owners equip their rifle with HK-grade components. The complete upper ships ready to install on a compatible lower receiver group, offering a premium option for those seeking HK reliability in a .308-pattern rifle.