a 6.5 Grendel (123 SST's) in an AR works great for a kid gun. Plenty of punch for Deer and pigs, and next to no recoil in that platform. You can collapse the stock all the way down and it fits the little ones well.


[Linked Image from i.postimg.cc]


[Linked Image from i.postimg.cc]


Both the deer and the pig were dropped DRT, never even took a step with the 6.5 Grendel.