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Just dropping in parts will not automatically make it better than stock.
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Allow me to disagree. By changing the springs in a bone stock 92FS (especially an older model), one immediately improves the gun over stock condition. Specifically, swapping in a reduced power mainspring, reduced power trigger return spring & upping the recoil spring by 2-3lbs.
Now before someone begins to chant about light primer strikes, I have done all of those things to all three of my 92's & have NEVER had the first light primer strike. Is there such a thing as too light of a mainspring? No doubt. But as long as one doesn't go below the 14lb (IIRC) rating of the DAO mainspring, one should never have issues.
I would also contend that swapping in an all-metal trigger over the newer plastic coated triggers offers an improvement as well.
Feel free to disprove any of these.............