Answer:
You throw me out when you want to use me and you take me in when you don't want to use me. Who am I?
With pointed fangs it sits in wait. With piercing force it doles out fate, over bloodless victims proclaiming its might. Eternally joining in a single bite.
My teeth are sharp, my back is straight, to cut things up it is my fate.
I fly through the air on small feathered wings, seeking out life and destroying all things.
Though I have neither legs nor feet, my use is for to go; Although I cannot speak, I tell what others want to know
What is always coming but never arrives?