Heckler & Koch Heckler Koch MR556 14" MRS Black Handguard 1002020-01

HK MR556A4 11" 5.56mm Upper Kit

Heckler & Koch HK MR556A4 16.5" Upper Receiver Kit w/Bolt, Buffer Spring, M-LOK, Supp Ready, Adj Gas Regulator, Pic Rail, & Ext Ambi Charging Handle

Heckler & Koch HK MR762 A4 16" 5/8x24 Threaded Bbl Upper Receiver Kit 51001892

Heckler & Koch HK MR556 A4 5.56mm 16.5" 1/2"x28 Bbl Semi-Auto Rifle w/(1) 10rd Mag 81000828

Heckler & Koch HK Handguard Rail SL8/USC/UMP/G36 MPN 702390

Heckler and Koch H&K MR556-A1 223 Remington/5.56 NATO 20 Rounds Magazine

Heckler & Koch HK MR556 12.5" Black M-LOK Handguard 51001100