The Phase 5 Hex2-C(TM) is hexagonal shaped AR type Buffer Tube complete assembly. This tube has been specifically designed to utilize the SB Tactical(TM) Pistol Stabilizing Braces. The Hex-2(TM) 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 SB15 Pistol Stabilizing brace (sold separately). Working closely with SB Tactical(TM) the Phase 5 Hex-2(TM) Buffer Tube is a perfect match. While asking questions along the way and updating the design based on the recommendations given by all; the Hex-2(TM) has become the perfect component for any AR pistol build. The Hex-2-C(TM) complete package includes a castle nut, end plate, Carbine Buffer, Phase 5 Enhanced Buffer Spring and foam pad. Specifications Overall Length: 7.4 inches Product Weight: 5oz Assembled Weight: 11.5oz Made in the USA