While it is not often easy to get a fine trigger pull it can be done, and done without dangerously light weight.
Light weight can mask "flaws" in the trigger pull, and so seems better but a good trigger of 4-7lbs is just as good a trigger and safer. I marvel at the fellow who can tell the difference between a 2.5lb and a 3lb pull. when all else is the same. I cannot.
There is a point, with a semi auto where the trigger simply can be too light for safety. Even the jar of the mechanism working can trip it, and that is simply TOO LIGHT!
No, it doesn't have to be a 14lb long stagey, gritty trigger with a half mile of take up and a quarter mile of overtravel, but a <3lb trigger on a 1911 pattern gun is just courting trouble, IMHO.
YOU aren't the only thing that can pull the trigger, and a pull weight close to, or less than the weight of the gun is a risky business.
Despite the fact that it makes a good target gun, when so fitted, the 1911A1 wasn't designed as one, it was designed as a service weapon, so there is a limit to what one can, and should do to the trigger, otherwise, "you're off the map, lad, there be dragons here!!"
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All else being equal (and it almost never is) bigger bullets tend to work better.
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