I bought two of these in the .280 height for my USP Experts. (.45 and 9mm) Best part is, Dawson includes both red and green fiber optic rods as well as a sight pusher in each package.
The instructions tell you to cut the existing fiber optic in the sight in half, and replace it with either the new red or green fiber optic they supply.
It is super easy. Cut the existing fiber optic in half, replace with which ever color you prefer, and simply melt the FO with a lighter so it fits perfectly in the cradle.
This is stupid easy, so order yours today with confidence.