I know both mossberg and remington make youth models, 870 youth from remington and bandit from mossberg.

870 is the same 870 pump adults used, just scaled down. Bandit is a model 500 pump, scaled down. The bandit comes with (well it did when my son bought his) a certificate to help upgrade to a full sized 500.

The bandit slug barrel is ported to reduce recoil and both come with recoil pads.

they are both awesome guns for youths.