Phase 5 Weapon Systems Inc Pistol Buffer Tube Black HEX-2. This tube has been specifically designed to utilize the SB Tactical Pistol Stabilizing Braces. The Hex-2 is a heavy-duty USA certified 7075 T7 billet aluminum buffer tube with the versatility to use the Phase 5 nitrile Foam Pad (included) or the SB Tactical Pistol Stabilizing brace (sold separately). Working closely with SB Tactical asking questions along the way and updating the design based on the recommendations given by all the Phase 5 Hex-2 Buffer Tube is a perfect component for any AR pistol build. Specifications for Phase 5 Weapon Systems Inc Hex-2 Pistol Buffer Tube: Manufacturer: Phase 5 Weapon Systems Inc Color: Black Condition: New Features of Phase 5 Weapon Systems Inc Hex-2 Pistol Buffer Tube CNC-machined 7075 T7 certified made in specialized factories billet aluminum Hexagonal Pistol buffer tube. perfectly designed to fit the Sig SB15 Stabilizing Brace Machined lower slot and anti-tilt technology built into every tube. Package Contents: Phase 5 Weapon Systems Inc Hex-2 Pistol Buffer Tube Castle Nut End Plate and Foam Pad Phase 5 Weapon Systems Inc HEX-2: Hex-2 Pistol Buffer Tube Black