I spent the entire afternoon taking the Marlin model 42 pump shotgun apart and cleaning it. There was only slight wear on a couple of small parts. I loaded up the gun with six shells and stood out back, aiming at the burn barrel. All six shells found the mark. I think that the gun is safe to shoot. There is a big lug on the bolt that should stop it from going through my forehead in the event of a meltdown.
I will only shoot light trap loads in this gun. Now, if I get anohter single action 357 the required gun foursome for CAS will be complete.