The Daniel Defense M4 Free Float tube is among the lightest rail systems available today. Each tube is precision CNC machined and then Military Specification Type III Hard Coat Anodized. Aircraft Grade 6061-T6 Aluminum is used exclusively so that strength is not sacrificed for weight. Daniel Defense M4 Free Float tubes were even chosen by the US Army Marksmanship Unit's Designated Marksman Rifle Program. The FSP model has a cutout in the top rail to accommodate the front sight base for a carbine length gas system and the FSPM has a cutout to accommodate the front sight on a mid length gas system. Every M4 Rail also includes a set of three 6" low-profile ladder rail covers. The barrel nut on this handguard is proprietary to Daniel Defense and requires a barrel nut wrench (not included) to be installed.
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