The Daniel Defense AR15 Lite Rail 7.0 is the lightest free float rail system to use a steel barrel nut. The Daniel Defense AR15 Lite Rail utilizes the Patent Pending Bolt Up SystemTM which allows the upper receiver to have a continuous uninterrupted upper rail platform.
The 7.0 Free Float Picatinny Handguard was designed to work with carbine length AR15 gas systems and its exceptionally light weight makes it perfect for short rifles where size and weight are crucial performance attributes.