If you want to still.
I have a new SS/Syn and I installed a John Mason brake. Fit was fine, Slightest amout of differance in diamiter between the brake and the barrel. The Brake does not fit the barrel as tight as the stock sight.
All that is needed to remove the old and install the new is a punch the size of the roll pin (or smaller), Small hammer, and a large brass punch (Aprox the size of the barrel).
Remove the rollpin with the punch.
Lightly clamp the barel in a vise so that the barrel is still free but the sight sits on top of the jaws. Useing the brass punch knock the barrel through the sight, but be carefull not to let the gun drop
Now that the barrel is naked just slip the new sight/brake over the barrel. Now, tap the roll pin into one side of the site just enough so that it stays there without falling out.
looking through the hole on the other side, line up the slot on the barrel with the holes in the break. gently tap the rollpin throught the sight and barrel.
Install your set screw and your finished!
You can check out how it looks here. Me and my Girls
BTW it is much louder with the brake installed. But, I can fire much faster now due to the loss of muzzle rise. I can actually watch the bullet hit the target.
I also have a gas bushing and recoil spring installed.