Tuning Webley jaguar

This one is from the 1950s my son's first rifle, he can master an iron sight with a not so giving performance once he's had a couple thousand pellets down it I will up grade him, I remember my first air rifle £40 brand new no scope big chunky thing, it was great fun in my teens I want him to have the same experience,,,

Little .177 in the back garden you can't go wrong,