I have & like the Williams.It has ALOT of ajustment and marks(white) so you can remember the locations for different rounds.It can't be raised all the way with a scope on,it must be lowered.But your not going to be using it with a scope anyway.You can also order different size apatures.It is very well made and has a set screw to secure it to the action.So far,no lock-tight needed.