If you get one with a factory one installed, check to see what the thread pitch is, Ruger used a couple standard pitches but you have to know which one is on your gun.
Some are pin on with a roll pin that slides over the barrel and front sight. You just have to use a longer roll pin that goes thru the front sight. This option is for minis without a factory brake. Mo-Rod has some nice custom pin on brakes for minis without the factory install.
Remember the battle of Athens, TN!
"Work as if you were to live 100 Years, Pray as if you were to die To-morrow." --Benjamin Franklin