The Phase 5 Hex-2 Buffer Tube Assembly is hexagonal shaped AR type Buffer Tube. This tube has been specifically designed to utilize the SB Tactical Pistol Stabilizing Braces. It is crafted of a heavy duty USA certified 7075 T7 billet aluminum with the versatility to use the Phase 5 nitrile Foam Pad (included) or the SB15 Pistol Stabilizing brace (sold separately). The Hex-2 has become the perfect component for any AR pistol build. It includes a castle nut, end plate, Carbine Buffer, Phase 5 Enhanced Buffer Spring and foam pad.