DPMS Panther Arms now offers the 6-Rail Free Float Tube, standard and carbine length, for AR rifles. These six-rail handguards feature a 2 3/8-inch diameter, 6,000 series, aluminum, one-piece, free float tube with a T6 heat treatment, hard-coat anodized black. Machined into the free float tube are six Picatinny rails featuring 30 slots per rail on the standard length tubes and 17 slots per rail on the carbine lengths. A total of 48 individual vents increase the airflow to the barrel and help cool the standard length tube while 24 vents disperse the heat on the carbine version. Each 6-Rail Free Float Tube includes a manganese phosphated steel locking collar that controls the timing on the rails.