Heckler & Koch MR556 A4 Upper Receiver, 223 Remington/556NATO, 16.5" Barrel, Threaded 1/2X28, M-LOK Handguard, Anodized Finish, Black, Fits AR-15 Lower Receivers, Includes Bolt Carrier Group, Charging Handle, Buffer Weight and Buffer Spring 51000384 UPC 642230270213

Upgrade your AR-15 with the premium Heckler & Koch MR556 A4 Upper Receiver. This complete upper assembly delivers exceptional quality, reliability, and performance in a ready-to-install package.

Heckler & Koch MR556 A4 Upper Receiver

The Heckler & Koch MR556 A4 Upper Receiver (model 51000384) is a high-end complete upper receiver assembly chambered in 5.56 NATO / .223 Remington. It features a 16.5-inch barrel with a 1/2x28 threaded muzzle, allowing for easy suppressor or muzzle device installation. The upper comes equipped with an M-LOK compatible handguard for maximum accessory mounting flexibility. Finished in a durable anodized black, this upper is designed to fit standard AR-15 lower receivers. The package includes a bolt carrier group, charging handle, buffer weight, and buffer spring, making it a true drop-in solution. The UPC 642230270213 identifies this specific Heckler & Koch MR556 A4 Upper Receiver.

Key Features of the Heckler & Koch MR556 A4 Upper

• Model: MR556 A4 Upper Receiver
• Caliber: 5.56 NATO / .223 Remington
• Barrel Length: 16.5 inches
• Muzzle Thread: 1/2x28
• Handguard: M-LOK
• Finish: Anodized Black
• Compatibility: AR-15 Lower Receivers
• Includes: Bolt Carrier Group, Charging Handle, Buffer Weight & Spring
• Model Number: 51000384

Ideal for Premium AR-15 Builds

This complete upper receiver is perfect for shooters looking to build or upgrade an AR-15 with genuine Heckler & Koch quality. The included components make installation quick and straightforward while delivering the legendary reliability HK is known for.

Why Choose the Heckler & Koch MR556 A4 Upper?

The 51000384 delivers premium German engineering in a complete, ready-to-install AR-15 upper receiver assembly.

Heckler & Koch. MR556 A4. 51000384. 642230270213.The End ```