I am not familiar with this particular autoloader, but with all of the other brands ive seen, timing of everything working together is what makes them function properly. It could be one component that is bent/broken, or just an issue of something that needs cleaned. Some of these guns can be finicky, i would tear it down as far as he is comfortable with and inspect/clean and lightly lubricate and try it again. If this doesnt work a gunsmith would prbly be the best bet, unless another member here has expierence with them and can help out farther.