Luth-AR Palm Handguard, 15, M-LOK, Aluminum, Free Float, Barrel Nut Included, Fits AR-15 Rifles, Black HG-V-15M The Palm Handguard 15" free float tube features a triangular profile that conforms to the palm of your hand" giving you a secure and comfortable grip on your rifle. The Palm Handguard provides a full length Picatinny top rail and M-LOK slots along both upper sides" as well as a row of M-LOK slots along the bottom to accommodate accessories such as a bipod. The lower sides are adorned with the Luth-AR Double L and Cartridge cooling cuts to further reduce weight and to provide heat dissipation with a distinctive good look.