RE: Single shot slug gun Question
It's nice to see girls excited about guns, that's a cute picture.
If I can make a suggestion, get a good recoil pad and put it on that thing. Those guns are light and your girl is small. I had one when I was kid and they kick pretty good, even for a 20 ga. I was about your daughters size. I could manage it, even with 3 inch shells, but when I put a recoil pad on it it was much more comfortable to shoot.
You could have that gun fitted with a 20 ga ultra barrel as well, or the standard rifled barrel with open sights.
Paul