Rev.
If you are talking about the trigger return spring….
The place to start is your local hardware store, remove the trigger return spring and take it with you to town.
Go to your favorite hardware store and they will have a display case full of springs, pick one the right diameter with finer wire, pick several they are about fifty cents each.
Cut one to length and try it, repeat until you get what you want, this spring keeps the sear engaged while you are slamming the action around so not to light.
So for cheap you can have the one that pleases you, besides it is a good way to fiddle away an hour or two on Saturday.
Probably not going to find one that small. If you have never messed with a moa trigger, you might think about not responding. Hint... Stick to your clay shooting instead..