Irv, I see where you are going with this.
The rifle combo balances well. Thepredator barel is a bit heavier then stock (I think) but not bad overall. It should carry well. Kick is less than the 150gr out of a 30-06 and probably good enough for a kid that is 120lb. I'm about 2x that so the 30-06 didn't bother me much, but my kid started flinching after 10 rounds. That was the lightest ammo on hand and he wanted to try a bolt gun that day. He is strong but thin, can deadlift 1.5x bodyweight and do 15 pullups in a row, so careying it should be fine.

Btw, a note on the Mod AR scope. With good light and properly focused, I was able to make out the holes ar 100yards on 9x. That is a huge step up for me from the bargain scopes I have been using.