This is the latest video by Yeager he brings up some good points about incapacitation vs lethality and training vs practice.

I have gone a slightly different route for Lory. I have ordered a CMMG .22 that uses a actual AR lower so now I simply will order an upper of her choosing and have two guns in one.

I use a lot of .22's for training and practice. I have conversions for my 1911 and Glock, a SIG 522 that mimicks my SIG 556 and an SD GSG MP5clone for those times I am issued an MP5 so I lots of bases covered.

.22 for Training, Practice and Defense - YouTube