Follow the instructions and it does not turn. - SB Tactical Vector Pistol Stabilizing Brace for KRISS Vector SDP Pistol

I have it mounted on an AR pistol. When I first installed it, like some other reviewers, I was unhappy that the brace turned on the tube. I visited SB's website and found they had a installation video. I watched the installation video and found the solution. SB braces are made one size, but to fit a range of tube size, it work with both mil-spec and commercial tubes. After following the installation video, wrapping the tube with electrical tape before sliding the brace on and the brace is rock solid.