I have an old Remington #2 SxS 12ga marked "fluid steel" I know the steel is not as strong as modern steel. The gun is sound. A gunsmith said to shoot it with light loads or Black Powder loads. I would lean toward the BP loads if I do shoot it. I was thinking about getting a set of incert 20ga or 28ga tubes and shooting it with them. Anyone care to opine. The gun is very light weight for a SxS 12ga.