Based on CQR GEN 1.0 Fore Grip but modified based on my preferences as well as considering the printing capability of my 3D printer.
Length: 185 mmHeight (from rail): 106mmScrew hole: 5mmDistance between screws: 80mm (center-to-center; 9 slots of picatinny rail)
*tried to maintain quads as much as possible (subd + boolean)