Stand-alone rail system for AR/M4 weapons with a standard A1/A2 front sight base. Allows for attachment of Picatinny rail mounted accessories forward of the front sight base. – Allows for attachment of Picatinny rail mounted accessories forward of the front sight base – Provides extended hand hold opportunities for shooters – Installs onto A1/A2 front sight base locking inside the front sight requiring NO modification to firearm – Includes Black ERGO LowPro Rail Covers – Weight: 8.7 ounces