Has it worked since the last time you had the gun apart? You can get the finger of the spring that is supposed to operate the grip safety over the grip safety instead of under...then it does not work. Or, you might have bent it... In any event, take it apart and look at the spring; I cannot imagine it not working if it is not broken off.
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill? (Exodus 22:18)