Replaces exsisting free float hand guard, Installs in minutes. * All four rails are of MIL-STD 1913 PICATINNY Specification. All rails are T-marked for easy accessory location * Machined from extruded aircraft grade aluminum alloy 6061 * Carbine Length Handguard Free Float 6 1/2" Tactical Quadrail For Foregrips & Lasers