The Mod 6 can be smoothed up which will give the "feel" of a much lighter trigger. I never replace the main spring, but do put a lighter rebound spring in. Stoning in the appropriate places makes all the difference, as well as correct lubrication. One thing I also do which make the 60 easier to shoot (double action) is to grind the grooves out of the trigger and contour and polish it. Better fitting grips also make a big difference.

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H Richard
SWCA1967 SWHF244