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  1. NEW & UNFIRED is a Factory German HK-MR556A1 Complete Upper Receiver, Date Code (BB). Barrel was Cut, Crowned to 10.4″ and Threaded 1/2 X 28 by TDyer Gunsmith. Has a 9″ Factory HK M-LOK Hand Guard with a Full Top Rail and Two Side Accessory Rails. Includes Charging Handle, & Bolt Carrier Group. Factory Gas Block was Relieved/Opened for Suppressed & Unsuppressed Fire. Test Fired Only by TDyer Gunsmith for Function. Ready for your SBR or Pistol Build. ALL NFA RULES APPLY. $1,750.00 Plus $25.00 Shipping - No Credit Card Fees https://www.sidearmsams.com/shop/hk-mr556a1-complete-upper-receiver-10-4-barrel-tdyer/ sales@sidearmsams.com - 954-960-2596