HK UPPER MR556A4 5.56 11" BLK
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Heckler & Koch MR556 A4 Upper Receiver, 223 Remington/5.56 NATO, 11" Barrel, Threaded 1/2X28, M-LOK Handguard, Anodized Finish, Black, Fits AR-15 Lower Receivers, Includes Bolt Carrier Group, Charging Handle, Buffer Weight and Buffer Spring 51000385
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