Been down this road too. Tried singles, doubles, and found the best to be a Remington 1100 Youth model in 20 gauge. Shells are cheap and easy to find. Best thing going for it is no recoil. A longer plug will convert it to a single shot and you can add a shell as you deem fit. I know it sounds awful, black stock and an automatic BUT if they enjoy shooting it and learn to hit with it you can upgrade later. If it ain't fun, they will not enjoy it. JMO