The Trinity Force Breach Blade 1.0 Pistol Stablizing Brace clamps to a pistol buffer tube and is secured in place by screws. So once the desired length of the brace is established you will tighten down the clamp screws. It is not adjustable without loosening the screws and then tightening them down again.
Yes, it should as it fits on an AR-15 pistol buffer tubes with a diameter of 1.25″.
This brace attached via "clamping action" you tighten the two bolts and it tightens the rings directly above them around the tube. You use it on any standard PISTOL tube that is smooth round all the way around. Just slide it back and forth to where you like it and tighten bolts to make it clamp down and stay there. NOT quick adjustable, you have to loosten and retighten bolts to adjust. Set it for what you like and leave it there. I like it. I have a gun with one of these braces on it and ran across your unanswered question when searching where to buy more of them as just the brace itself.