Weatherby SA-08 youth 20ga, 12 1/2" lop, longer stock is only $55 fom Weatherby, lightweight with the 24" barrel, screw in chokes, 3" capable, light recoil and the best part, $450-$500 new depending on where you shop.
my 12 year old used the same gun to trapshoot with until i moved him to a browning bt-99.he still uses it to dove and squirrel hunt and is a good all around gun.my son was recoil shy and this gun didnt beat him up too bad.