Guns with a very light trigger are a bit more likely to "double" or go full-auto if you "slap" the trigger ... the trigger can release the hammer just from the trigger's own inertia, when the slide slams home. Pulling the trigger all the way aft will prevent hammer-follow when the slide slams home, because the trigger won't have reset by then. With heavier triggers, a full-back trigger pull isn't required.
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