A semi-automatic firearm will only fire one round per trigger
pull, then the trigger must be released and pulled again to fire
the next round. A fully automatic firearm will fire as many rounds
as it has available as long as the trigger is pulled.
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Handgun, semi-automatic
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$10 to $10,000. Depends on which gun- and there are thousands of
different semi-autos.
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Yes, and it generally means something is wrong with the sear. If
you have a semi automatic that is doing this, it needs to be
fixed.