My father-n-law bought a FA-91 from a police auction. He went home to fire it and it would not fire. He gave it to me and asked me if I could take it apart and make sure all the parts were there. I took it apart and sure enough all the parts were there. To my knowledge, which is very basic, it should fire. I know the bolt is kind of unique and has to be spaced a certain way. Could that be keeping it from firing?