Strike Industries GRIDLOK416FD9 GridLok Full Duty With Quick Detach System 9 inL 1.57 inD M-LOK Black Aluminum for HK 416, HK MR556, M27 IAR MAP GRIDLOK416FD9 show more like this Flat Rate $11.99 Accessories, $20.00 Per Firearm Hinterland Outfitters Strike Industries GRIDLOK-416-FD-9 GridLok Full Duty With Quick Detach System 9"L 1.57"D M-LOK Black Aluminum for HK 416, HK MR556, M27 IAR $297.32 GRIDLOK416FD9 show more like this Shooting Surplus Strike Industries GRIDLOK-416-FD-9 GridLok Full Duty With Quick Detach System 9"L 1.57"D M-LOK Black Aluminum for HK 416, HK MR556, M27 IAR $306.28 GRIDLOK416FD9 show more like this $10.49 Classic Firearms