My first shot gun was a Stevens single shot 20 gauge with a side lever and sans transfer bar (they were all made that way back then). I was 9 years old, but could not go out with it with out adult supervision. I got to keep the gun in my room, but Dad kept the shells. I really worked with that gun, I could barely pull the hammer back at first. After practicing with it for a long time I was proficient at pulling the hammer back and putting it back down safely. Part of the problem was my small hand, another part was the strength I had in my hand. Back in those days it was use a hammer gun with out a transfer bar or do not use one at all. I know I never had an accident. Tens of thousands if not 100's of thousands of kids had shot guns with out a transfer bar and were perfectly safe. If you are over 50, the chances are real good that you hunted with a single shot shotgun with out a transfer bar. However there were accidents, very unfortunate accidents. The percentage was very low, but 1 is too many. I recall a young teenager that leaned his loaded shot gun against a fence and then climbed the fence over the top of it. I am not sure what happened other than he was shot in the abdomen and bled to death in short order. I know it was a hammer shotgun so I suspect his foot hit the hammer or trigger or the fence he was standing on did. That accident MAY have been prevented if it had a transfer bar, most certainly if he practiced safe gun handling. I do not think I would let a kid use a gun any more with out a transfer bar, especially one that is unfamiliar with the gun and one that has not practiced extensively with adult supervision. Even if I had a family heir loom, I think I would get them a newer gun to learn and practice gun safety with before I would let them use the older gun.