I like the feel of a wider, more bulky trigger surface than many, especially rimfire rifles have. With that in mind, I decided to build my own.
I used common clear plastic, semi soft tubing. I heated it slightly by passing it comfortably over a gas range flame..I suppose holding it in a stream of hot water would work as well.
The heat softens it so it slips onto the trigger fairly easily. Just remember to heat only the portion you want to expand, salip onto trigger and trim.
Shown here on my Anschutz "woodchucker",...second photo includes a piece of the tubing, available at most hardware/building supply stores.