The Daruma Custom HALO MOD Fore Grip integrates form with functionality. The design allows the operator to use it as a hand stop when going with the thumb over method. The grip allows the operator to manipulate the weapon with confidence and the organic design enables the operator to handle the weapon in ways that's not quite as fluid with other vertical grip designs. It comes with two sets of screws. The black screws are for M-Lok rails whereas the silver screws are for Keymod.