The Palm Handguard 15 free float tube features a triangular profile that conforms to the palm of your hand giving a secure and comfortable grip on an AR15. The Slotted versions of the Palm Handguard provide a Picatinny top rail and KeyMod or MLOK slots along both upper sides as well as a row of KeyMod or MLOK slots along the bottom to accommodate accessories such as a bipod. The lower sides are adorned with the Luth-AR Double L and Cartridge lightning/cooling cuts to further reduce weight and provide heat dissipation with a distinctive good look. The Smooth version of the Palm Handguard provides a Picatinny top rail for attaching scopes and accessories (Note: the Smooth version does not have slots on the bottom). Includes heat treated alloy steel barrel nut with a manganese phosphate finish.