Posted this on the gunsmith board but no bites:

Loaned my pro hunter slug gun to a buddy this past weekend and when he cocked it to try and shoot a doe the trigger would not pull, it would not release, and it would not open. I took the stock off and took the springs out, released the trigger and was able to open it up and unload it. I put it back together and it did the same thing again. I have not had a chance to completely tear it down but was hoping someone on here might have a suggestion. Thanks