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There are several trigger characteristics, some of which, if bad, can seriously affect accuracy. First is weight, or the number of pounds (ounces) of dead weight required to "pull" the trigger when hung from the trigger with the gun pointed directly upward. That is the method used in measuring trigger pull weight for compliance with match shooting rules. There are scales and spring measures made that can also be used, more conveniently, but not as accurately or officially.
The less the pull weight, given the use to which the gun will be put, the better as long as it is safe.
The second is smoothness. That usually depends of how well the trigger, the sear, and other parts have been polished. No trigger can be very good if the trigger/sear surfaces look, under magnification, like a rocky road that has been run over by a bulldozer. The resulting feel is usually described as "creep".
Generally, a heavy but smooth and consistent pull can be overcome with practice. A rough pull is much harder to deal with, and most shooters will have a rough trigger pull improved if possible. But there are many traps for the unwary in trying to work on trigger pulls. The most common BAD result is ending up with a trigger pull that is too light and dangerous.
Jim
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