Curious about a 500 20ga. With a 22" barrel with wood furniture, would it be considered a bantam or did Mossberg made a full size too? Reason I ask, I'm considering the above for my son, I'm scouring the Internet to see IF there is a difference, the gentleman is looking for ammo in trade, .223, .40, 12ga. and .22lr so if anyone has any thoughts on a round about price too, I would appreciate it. Thank you.