I just got a package from my sister and its a crossbow that shoots bolts which is cool but I put it together anD IT FIRES THEM AT ABOUT 800 FPS I COULD HAVE KILLED MY ROOMMATE I ALMOST SHOT IT AT HIM BUT I HIT A METAL CHAIR THAT THE BOLT WENT THROUGH

I took the metal tip off so its just a plastic bolt 

aND ITS STILL PRETTY DEADLY

Where did your sister acquire this.