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HK

HK HK UPPER MR556A4 5.56 16.5" BLK

Product Code : 642230270213

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Mfg Item #: 51000384

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Heckler & Koch MR556 A4 Upper Receiver, 223 Remington/556NATO, 16.5" 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 51000384

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