帶隔層的斜角前握

This is an aioft fore-grip that attaches to picatinny rail, it has a compartment in the back for an extra power bank and other things that are small. you could even take the model and put a hole in the back-cap for a cord that ru through into a phone or scope camera etc. It takes 8-32 1 1/2 inch screws and nuts that will hold in place tightly (careful not to crack it). The fore-grip also has a longer front drop-down so you can also put your hand there for a more vertical grip.