Had my gunsmith install a white outline rear blade in the Micro base on the .44 Special Flattop.
Had to go back & have him replace it with another one.
It's no big deal, the part can be obtained from Ruger, but be aware that Ruger offers different height blades.
The first one left my gun shooting several inches high at 25 yards cranked all the way down.
The second (different height) is right on.
If you order one, make sure you know which one to fit your gun.
Denis