I purchased a Charles Daily shotgun, my first semi. I was wondering what others think about this shotgun's performance. I also took it apart to clean it and had trouble putting it back together. I had a o ring that I missed putting back on the gun. I know it is important or else they would not have put it there. So it is time to check the web for info on where it goes. Does anyone know what this o ring is for? Thanks for your help.