[wjh2657]

I always had better patterns and better luck hunting with 2 3/4 " shells in my Mossy 500 anyways. When I decided I needed 3" shells, I bought a Mossy 835Super Turkey for the 3" brass. (It shoots so tight I've ended up putting a scope on it!) Good luck with firing pin change, but I really think you are looking for a solution to a non-problem. Especially if gun is older, shoot 2 3/4" in it.