Heckler & Koch MR764A4 URK 16in 7.62 NATO AR Upper Kit for Receivers

The MR764A4 URK from Heckler & Koch combines precision engineering with rugged reliability, delivering the MR762A4 upper kit in a 16" 7.62mm configuration that is ready to integrate with compatible AR-platform receivers for serious long-range performance. This upper receiver assembly pairs HKs renowned manufacturing standards with a streamlined design that supports consistent slow-fire accuracy, smooth cycling, and dependable chamber performance across demanding field conditions. Built to handle the versatility of 7.62 NATO/.308 caliber engagements, the 16" profile provides an optimal balance of velocity, muzzle energy, and maneuverability for hunting, precision shooting, or tactical training scenarios. The URK package emphasizes durability and repeatable shot placement, featuring robust factories-standard machining, precise fitment to minimize play, and a dependable gas system engineered for steady operation under a range of environments. Whether youre outfitting a dedicated AR platform for target ranges or configuring a high-performance hunting rifle, the MR764A4 URK offers a cohesive, high-quality upgrade that translates core HK advantages into practical, field-ready capability. With this upper kit, shooters gain a turnkey solution that supports consistent accuracy, reliable cycling, and long-term service life.