HK UPPER MR556A4 5.56 11 BLK;42;HK;2499.00;1791.00;142;0;MR556 A4 Upper Receiver;Heckler & Koch;51000385;Allocated;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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HK UPPER MR556A4 5.56 11 BLK;42;HK;2499.00;1791.00;142;0;MR556 A4 Upper Receiver;Heckler & Koch;51000385;Allocated;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 at Murder Creek Armory in Griffin, Georgia.