I have a Smith and Wesson Model 1000 12g shotgun. This was passed down to me by my grandpa. When i shoot it, the slide doesnt recoil enough to launch the shell out of the gun. I have to manually pull the slide, and remove the shell. If memory serves me well, it did this a few years ago, and all it needed was a good cleaning. Well the cleaning didnt do anything. Does anyone have any ideas, its not making any sense to me.