Specifically designed for Law Enforcement and Special Operations communities who have adopted the HK416/M27 IAR platform in the U.S. and all around the world. The Strike Industries GRIDLOK Rail for 416 gives you a primary a secondary or multiple setup options as a quick and direct handguard swap. The GRIDLOK Rail for 416 has the SI patent pending Quick Rail Detach GRIDLOK locking latch and mounts on using the factory HK OEM barrel nut in seconds you can replace the HK standard rail with an outfitted GRIDLOK as a primary handguard and use your HK rail as a secondary handguard. COMPATIBILITY: HK416/HK416 A5/HK416 A7/MR556/M27 IAR (w/o ambidextrous sling attachment points)