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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.