HK MR556A4 Upper Receiver Kit configured with an 11 inch barrel is a purpose-built upper assembly designed for the MR556A4 platform. This kit provides the upper receiver components needed to assemble a compatible MR556A4-style firearm configuration using the correct lower receiver.

Key features

• 11 inch MR556A4 upper receiver kit configuration
• Built for the MR556A4 platform upper assembly interface
• Aluminum alloy upper receiver construction with a steel barrel

Upgrade or replace your MR556A4 upper receiver assembly with a kit engineered for reliable platform fitment.