Had it happen once a long time ago on an 870. Best I recall it ain't so easy to get to but used a center punch to restake it as best I recall. Can't help on the trigger, never saw a need to improve one yet. There is or was someone who offered trigger jobs on them a few years back. VERY expensive. If it's really that bad let a gunsmith or Remington check it and they might be able to improve it some.
GB