Used Heckler & Koch HK MR556A4 Upper Receiver Assembly 11.5" 5.56 NATO MR556 A4

Key Features

• Item Type: Rifle Upper
• Manufacturer: Heckler & Koch USA (HK USA)
• Model: MR556A4 Upper 11.5" 5.56 NATO
• Caliber: 5.56mm NATO
• Overall Condition: Excellent

Product Description

Heckler & Koch USA (HK USA) MR556 A4 11.5" 5.56 NATO Upper Receiver Assembly (RAL8000)

This HK USA MR556 A4 upper receiver assembly is built around an 11.5" cold-hammer-forged 5.56 NATO barrel and HK’s short-stroke piston operating system. The setup includes an adjustable gas block and a free-float M-LOK handguard for accessory mounting.

Finished in RAL8000 and fitted with an extended ambidextrous charging handle and a muzzle device installed on 1/2x28 threads.

Specifications