A great quality product from XPower. This alloy buffer tube will fit straight onto the M4 RIS stock adapter or your M4A1 Gen 9 for a strengthened solution to the typically weak buffer tubes and rear attachment.
You will need the M4 RIS stock adapter and alloy spring retainer (for M4 RIS). The bolt from this will go straight through into your gearbox making it the strongest possible solution for your blaster! You will also need to lengthen your wires going to your battery as Well for some reason made them incredibly short.