They fit the full size only, not the Centurion.
I have one which I have run on a M9A3 (D spring, 92X type frame) and a full size LTT.
I got light strikes with both pistols, and found I had to increase weight to 18lb hammer spring to get reliable ignition with Federal bulk 22lr.
With that heavy spring compared to the LTT stock spring or even a D spring the difference in trigger pull is considerable and really diminishes its value as a trainer.