When I bought a 617-6, from an individual, it had no keys with it. I figured I might need a set if it ever had a malfunction (like I heard so much about), so I called S&W and they sent me a set free. At about the time I had a Remington 700 VS with a similar lock and I called them, and they said I would have to order a set and pay for them. I fixed it by removing that shroud and firing pin and installing a Timney.