i agree with every thing above ....
rifles ........................at 12 you prob want some thing light small compact .. i had a springer as a lad it was an old webley loud as hell fired it .everything for 100 yards legged it . im not saying there all loud but they are louder than pcps .....
you should be able to find full set up with pump the lot for 300 350
def go to a gun shop try a few for feel , fit , size .. when you hold the right one you will no its the one ....
when my nephew is old enough hes getting a bsa ultra multi , or air arms s200 ....
if you decide on s