I have a Phase 5 tube already, I know know how king kong feels like when he puts on a regular condom. That brace was tight as a mofo on that pistol tube. I think i threw up 3 discs and gave myself a hernia,
Maybe i don't understand the benefit of the SB15 buffertube. I like mine fully collapsed anyway, and the SB15 i've read adds an additional 1.5" to the OAL.