HK 51001919 A4 Complete Upper Rcvr Assembly 7.62x51mm Cold Hammer Forged Steel 13",Complete Uppers

Overview

The Heckler & Koch MR762 A4 Complete Upper Receiver Assembly is a fully assembled 7.62x51mm NATO (.308 Winchester) upper-receiver and barrel solution designed for AR-10 platform builds compatible with MR762 lower receivers. It utilizes a reliable short-stroke piston and pusher-rod operating system rather than a traditional direct-impingement gas tube, keeping hot carbon fouling and waste gases out of the receiver area to enhance reliability and simplify maintenance. This upper features a 13-inch cold-hammer-forged steel barrel with a threaded muzzle (5/8"x24) for attaching suppressors or muzzle devices. Additional components include an upper receiver with forward assist, an adjustable gas block, an extended convertible charging handle, an HK Free Floating Rail System handguard for accessory mounting, a complete bolt group assembly, a tungsten-filled proprietary buffer, and a proprietary buffer spring. The assembly is finished in black and ships in an HK soft case.

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