One thing to be aware of is that the sight will probably not line up parellel to the bore when tightened down. You can use a small nylon washer or, what I did was to wrap the barrel with two thicknesses of electrical tape and then, using some blue locktite, screw the sight in until it was parallel and tight. After letting the locktite set up overnight, I used an Xacto knife to trim away the tape from the sight base.
