my main reason is I started shooting when I was about 7 (dad believed it was better to teach my brother and I vs us being curious and getting hurt) and i would sit in my room and dry fire my shot guns. (I was 7 give me a break!!) The next rabbit season i went to fire my gun and it would not fire, gun smith told me that i had fractured the pin from dry firing. After that I never dry fired a gun again. On another note when my brother was in Police Acc. they dry fired all the time for training purposes, instructor swore up and down it would never hurt the weapon. I guess I would just rather be safe.