I have all three calibers and there has been no need for any "tinkering". I have made a very few adjustments to the hammer spring and lighten the trigger a bit but that's it it's already regulated, no need to replace it, my shot to shot is extremely consistent if you want let me know I can show you the Chronos because I Chrono every single shot. As they say "if it ain't broke don't fix it"
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