Trigger spring for Uberti 1873. Trigger pull will be reduced. 

I recommend to grind with Dremel and a diamond rotation tool a small slot at the tab of the sear, to prevent the spring sliding right or left side off the sear.

You only buy spring and washer. 

Spring can be bend.

While this part is easily installed, it is not drop-in, it requires fitting by a competent Gunsmith.