HK-MR556A1 Complete Upper Receiver 10.4″ Barrel with Factory HK Quad Rail by TDyer – 143-037489

NEW & UNFIRED Factory HK-MR556A1 Complete Upper Receiver, 10.4″ Barrel, Factory Quad Rail and More! New Production Date Code (CC & CD) 2022/2023.  S/N 143-037489.

Barrel was Cut & Crowned to 10.4″ and Threaded 1/2 X 28 by TDyer Gunsmith. Has a Factory German HK, 9″Inch HK416 T-Marked Quad Rail Hand Guard. Includes Factory Charging Handle, & Complete Factory MR556  Bolt Carrier Group and Factory Bird Cage Flash-Hider.  Factory Gas Block and Barrel Port were Relieved/Opened for Suppressed & Unsuppressed Cycling. File Pics.

This New & Unfired Factory Upper Receiver Comes Complete with the Factory Charging Handle & Complete Factory MR556 Bolt Carrier Group for a Complete Drop-in Plug-n-Play Unit.

Test Fired in both Configurations for Cycling by TDyer Gunsmith Only.

Includes a “Certificate of Authenticity” with Serial Number from TDyer Gunsmith for the Upper Receiver Conversion to 10.4″.

Ready for your SBR or Pistol Build.

ALL NFA RULES APPLY.