If your tired of plain old round buffer tube - Phase 5 Weapon Systems Inc Hex-2 AR-15 Pistol Buffer Tubes f/ SB Mini Brace

The Hex buffer tube is for you. This is only the buffer tube. The SB mini brace is sold separately. If your not sure you want to go the brace route or not get the Hex tube now and you can always add the SB mini brace later. The Hex tube is specially cut to fit the internal grooves in SB mini brace. I currently just have a buffer tube pad on mine