tek4260, I have been putting these trigger springs in Ruger NM S/A revolvers for over 25 years. I still have a small stock of original Bullseye springs. The Bullseye is a little smaller diameter wire than Lee's model. In my opinion and experience, this trigger spring offers the very best "leverage" for a light trigger pull in the Rugers. The late gunsmith George Nonte, experimented with this type of spring configuration in the middle 70's. I highly recommend this style of spring!....................Dick :wink: