I did a lot of work on duty weapons back in the 70's - when EVERYBODY (almost) carried revolvers. The "Standard" for K-frame Smiths was to adjust the mainspring tension (using the tension screw)so that hammer lift (Trigger held in Pulled position, spring gauge lifting lowered hammer, hook of spring gauge engaging hammer just below firing pin) would be in the 3-1/2 to 3-3/4 pound range. Reliable ignition, improved DA trigger. But that is only part of a competent and complete revolver trigger job .... With certain other careful techniques, most revolvers came out of my shop with a trigger pull of 8 - 9 pounds. But more important than weight of pull is that the entire stroke of the DA trigger was smooth and uniform.
TRIGTECHR
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