If you are referring to the sight "canting back and forth" along the long axis of the barrel, that's pretty normal for the slip-on type of sight. In order to defeat that teeter tauter motion, you would need a tighter fit (pressure fit) which would cause problems for some novice installers. You can drill and tap a hole for a set screw, on the bottom side of the sight, or do as I did, and add a brass shim to the back/bottom side of the sight.many, many thanks for the info.
Well when I got the roll pin through, the sight would cant back and forth. .