FWIW I took my new 642 to my gunsmith to see if he would smooth up the trigger and perhaps lighten it. He told me he wouldn't touch it until I had at least 500 rounds through it. He said let the metals get hot during firing and mate up the parts, and the trigger will smooth out. So far I have 150 rounds through it and the trigger is definitely smoother than when I first bought it. And I'm used to it now, so I'm thinking I'll just leave it as is......it should get better on it's own.